 ★ Free online encyclopedia. Did you know? page 118

## 511 (number)

511 is a natural number after the previous 510 and 512. It is a Mersenne number, being one less power 2: 511 = 2 9 − 1 {\the style property display value 511=2^{9}-1}. As a result, 511-number-repdigit and a palindrome in bases 2 111111111 2. It i ...

## 512 (number)

512 is a natural number after the previous 511 and 513. 512 is a power of two: 2 9 2 9-th power cube 8: 8 3. This is the eleventh Leyland number. 512 is also the third Dudeney number.

## 52 (number)

Fifty-two is the 6th bell number and a decagonal number. He is untouchable, because it is not the sum of the proper divisors of a number, and it is a noncototient since it is not the answer for the equation x − φx.

## 53 (number)

53 written in hexadecimal is 35, that is, the same symbols used in the decimal representation, but reversed. Four additional multiples of 53 share this property: 371 = 173 16, 5141 = 1415 16, 99481 = 18499 16, and 8520280 = 0820258 16. Apart from ...

## 54 (number)

54-19-gonal number. Twice the third power of three, 54 is the number of Leyland. 54 can be written as a sum of three squares three different ways: 7 2 1 2 = 6 2 3 2 3 2 = 5 2 5 2 = 54. This is the smallest number with this property. Like all othe ...

## 55 (number)

55-10-th Fibonacci number and a triangular number the sum of consecutive numbers from 1 to 10. It is the largest Fibonacci number, also a triangular number. It is a square pyramidal number, sum of squares of numbers from 1 to 5, and heptagonal ro ...

## 555 (number)

It is a sphenic number. In base 10, it is a repdigit, and because it is divided by the sum of its digits, it is a Harshad number. It is also a Harshad number in binary, base 11, base 13 and hexadecimal.

## 56 (number)

56: The number of ways to choose 3 of the 8 items or 5 out of 8 when order does not matter. The number of sections the number of distinct ways 11 can be represented as a sum of natural numbers. The only known number N such that φn − 1σn − 1 = φnσ ...

## 57 (number)

Fifty-seven sixteenth discrete conjugacy of finitely generated subgroups of a free and sixth in the 3.the question of the family. With 58 it forms the fourth discrete Bi Prime pair. 57 has an aliquot sum of 23 and the first element of the composi ...

## 58 (number)

Fifty-eight is the sum of first seven numbers, in 11-gonal number and a Smith number. Given 58, the Mertens function returns 0. No solution of the equation x – φx = 58, making 58 in noncototient. However, the sum of the totient function for the f ...

## 59 (number)

Fifty-nine-17-th Prime number. The following sixty-one, with whom she has two Premier. 59 is an irregular Prime safe and the 14th Prime supersingular. This is a Prime, so it is no imaginary part and real part of the form 3 N − 1. Starting with 15 ...

## 593 (number)

593 is an odd number. It is a prime number, an example of what Paul Erdos and Ernst G. Straus called a Good prime, or a prime whose square is greater than the product of its neighboring two primes. As such it is part of sequence A028388 at the On ...

## 6

6 is the smallest positive integer which is neither a square number nor a Prime number. Six is the second smallest composite number, its proper divisors 1, 2 and 3. Since six equals the sum of its proper divisors, six is the smallest perfect numb ...

## 60 (number)

It is a composite number with divisors 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60, making it a highly composite number. Because the sum of its unitary divisors, excluding itself it is a unitary perfect number, and it is copious amounts of with ...

## 600 (number)

In Latin, sescenti often referred to very large, but uncertain number, perhaps the size of the Roman cohort. 600 is the advertised number of miles that NASCAR runs in the Coca-Cola 600, the longest race on any of the NASCAR circuits. FIAT 600. (Ф ...

## 61 (number)

61 is: Centered decagonal number. (Центрированное десятиугольное число) A centered hexagonal number. Centered square number. (По центру квадрата числа) A palindrome in bases 6 141 6 60 11 60. Exhibitor 9th Mersenne Prime. 2 61 − 1 = 2.305.843.009 ...

## 613 (number)

613 is a Prime number, the first number of Prime triplet, the average number of sexy Prime triple P − 6, P 6. This indicator Prime Lucas number. 613 is a centered square number with 18 per side, circular number of 21 with a square grid and 27 usi ...

## 6174 (number)

6174 is called Kaprekars constant after the Indian mathematician D. R. Kaprekar. This room is notable for the following rule: Arrange the digits in descending and then in ascending order to obtain two numbers of four digits, adding leading zeros ...

## 62 (number)

62 is: Repdigit and a palindrome in bases 5 222 5, 30 and 22 30 61 11 61. The number of faces of two Archimedean, in the rhombicosidodecahedron and the truncated icosidodecahedron. A single number, the cube of which number system base 10 238328 3 ...

## 63 (number)

63-is: The deficit is a composite number. The sum of the powers of 2 from 0 to 5. Repdigit and a palindrome in bases 2 111111 2, 4 333 4, 8 77 8, 20 33 20 62 11 and 62. A number of the Woodall i.e. form 2 N − 1 With N = 4. A number of the form 2 ...

## 64 (number)

Sixty-four is the square of 8 the cube of 4, and the sixth power of 2. This is the smallest number with exactly seven divisors. This is the lowest positive power of two that is adjacent to neither a Mersenne Prime or Fermat Prime. 64 is the sum o ...

## 65 (number)

Sixty-five is 23 conjugacy of finitely generated subgroups of a free and 3-d shapes 5.question. It is an octagonal number. It is also a Cullen number. Given 65, the Mertens function returns 0. This number is the magic constant of 5 by 5 normal ma ...

## 65.536

65536 is a natural number following and preceding 65535 65537. 65536 is a power of two: 2 16 {\the style property display set to 2^{16}} 2 to 16th power. 65536 is the smallest number with exactly 17 divisors.

## 65.537

65537 is the largest known Prime number of the form 2 p 1 {\the style property display set to 2^{2^{N}} 1} n = 4 {\the style property display the value of n=4}. Therefore a regular polygon with 65537 sides constructible with compass and ruler wit ...

## 66 (number)

66 is: Semi-meandric number. (Полу-meandric количество) A hexagonal number. (Гексагональной количество) Repdigit and a palindrome in bases 10 66 10, 21 and 33 21 32 22 32. In sphenic number. (В sphenic число) In erdős–woods number, as it is possi ...

## 666 (number)

666 is the natural number following 665 and preceding 667. 666 is called the "number of the beast" in most manuscripts of Chapter 13 of the book of Revelation, the New Testament, but also in popular culture.

## 67 (number)

67: Prime Pillais 18! 1 is divisible by 67, and 67 is not more than a multiple of 18. Irregular Prime. (Нерегулярные Премьер) Happy Prime. (Счастливый Премьер) The sum of five consecutive primes 7 11 13 17 19. Prime numbers of the 19-th following ...

## 68 (number)

68 is a Perrin number. It is the largest known number to be a sum of two primes in exactly two different ways: 68 = 7 61 = 31 37. All higher even numbers that have been checked are the sum of three or more pairs of Prime numbers, the hypothesis t ...

## 69 (number)

69 is: In the number of Blum as the two factors of 69 are both Gaussian primes. Lucky number. (Счастливое число) The third composite number in the 13-aliquot tree. The aliquot sum of sixty-nine 27 in the sequence aliquot 69.27.13.1.0. In the conj ...

## E (mathematical constant)

The number e is a mathematical constant that is the base of the natural logarithm: the unique number whose natural logarithm is equal to one. It is approximately equal to 2.71828, and is the limit of n as n approaches infinity, an expression that ...

## Pi

The number π is a mathematical constant. Originally defined as the ratio of a circles circumference to its diameter, it now has various equivalent definitions and appears in many formulas in all areas of mathematics and physics. It is approximate ...

## −1

In mathematics, -1 is the additive inverse of 1, that is the number that when added with 1, gives the additive identity element, 0. It is a negative number greater than negative two and less than 0. Negative has nothing to Eulers identity E I π = ...

## 7

In the beginning, various Hindus wrote 7 more or less in one stroke as a curve that looks like an uppercase J vertically inverted. Western letter Gubar the main contribution of the Arabs was to make more diagonal rather than straight, though they ...

## 70 (number)

70 is: The number of ways to select 4 objects out of 8 when order does not matter. This gives the Central binomial coefficient. In sphenic number because of factors, such as 3 different numbers. The smallest weird number, a natural number that is ...

## 71 (number)

71 is: Twenty-third term of the Euclid–Mullin sequence, as it is the least main factor more than the product of the first twenty-two conditions. The largest number that occurs in the Prime factor of the order of a sporadic simple group. Prime Pil ...

## 72 (number)

Seventy-two is the sum of four consecutive Prime numbers 13 17 19 23 as well as the sum of six consecutive primes 5 7 11 13 17 19. The product of 8 and 9; 72 is a pronic number. The sum of a Eulers totient function φx during the first fifteen int ...

## 720 (number)

720 is the natural number following 719 and 721 of the previous one. This is a 6! 6 the factorial of a composite number with divisors thirty, more than any number lower, making it a highly composite number. It is a Harshad number in every base fr ...

## 73 (number)

73 is a natural number below 72 and preceding 74. In English, the smallest natural number with twelve letters in its spelled name.

## 700 (number)

700 is the natural number following 699 and preceding 701. This is the sum of four consecutive primes 167 173 179 181. It is a Harshad number.

## 74 (number)

74 is: The number of palindromes in bases 202 36 22. Twenty-first distinct conjugacy of finitely generated subgroups of the free and the eleventh of the form 2× question. In nontotient. (В nontotient) There are 74 different non-Hamiltonian polyhe ...

## 743 (number)

743 is the natural number following 742 and preceding 744. Its a Prime number. 743 is a Sophie Prime-Germain, because 2 × 743 1 = 1487 is also Prime. There are 743 precisely independent sets in a four-dimensional hypercube, 16 vertices, and exact ...

## 76 (number)

76: In nontotient. (В nontotient) In the Lucas room. In erdős–woods number, as it allows you to find sequence, 76 consecutive integers such that each inner member shares a factor with the first or the last member. Phone number. (Номер телефона) C ...

## 77 (number)

77 is a natural number below 76 and preceding 78. Seventy-seven is the smallest positive integer requiring five syllables in English.

## 78 (number)

78 is: In sphenic number has 3 different Prime factors. The 12th triangular number. In a semiperfect number and a multiple of a perfect number. In erdős–woods number, as it is possible to find a sequence of 78 consecutive integers such that each ...

## 79 (number)

79 is: A cousin Prime with 83. Happy Prime. (Счастливый Премьер) A Good Prime. (Хороший Премьер) In permutation and ninety-seven. Sexy Prime with 73. Conventional Prime. (Обычные Премьер) The smallest Prime number p for which the real quadratic f ...

## 8

8 is: The order of the smallest non-Abelian group, all subgroups of which are normal. The Fibonacci number, being 3 plus 5. The next Fibonacci number 13. 8 is the only positive Fibonacci number, except 1, which is a perfect cube. The base of the ...

## 80 (number)

80 is: In a semiperfect number, so to add some subsets of its divisors, e.g., 1, 4, 5, 10, 20 40 gives 80. In a repdigit in bases 3, 9, 15, 19 and 39. Love the room. (Любовь номер) A palindrome in bases 3 2222 3, 6 212 6, 9 88 9, 15 55 15, 19 44 ...

## 800 (number)

800 is the natural number following 799 and preceding 801. This is the sum of four consecutive primes 193 197 199 211. It is a Harshad number.

## 801 (number)

801 is the natural number following and preceding 802 800. 801 is the sum of a square and a positive cube in more than one way, and the sum of distinct positive cubes in more than one way: 801 = 17 2 + 8 3 = 26 2 + 5 3 = 1 3 + 2 3 + 4 3 + 6 3 + 8 ...

## 81 (number)

81 is: The number of palindromes in bases 8 and 8 121 26 33 26. In Harshad number in bases 2, 3, 4, 7, 9, 10 and 13. The tribonacci number. (Количество tribonacci) The ninth member of the MIAN-Chowla sequence. One of the three non-trivial numbers ...

## Encyclopedic dictionary

Translation
 аҧсуа Afaraf Afrikaans Akan Shqip አማርኛ العربية Aragonés Հայերեն অসমীয়া авар мацӀ avesta aymar aru azərbaycan dili bamanankan башҡорт теле euskara Беларуская বাংলা भोजपुरी Bislama bosanski jezik brezhoneg български език ဗမာစာ Català Chamoru нохчийн мотт chiCheŵa 中文 чӑваш чӗлхи Kernewek corsu ᓀᐦᐃᔭᐍᐏᐣ hrvatski česky dansk ދިވެހި Nederlands English Esperanto eesti Eʋegbe føroyskt vosa Vakaviti suomi français Fulfulde Galego ქართული Deutsch Ελληνικά Avañeẽ ગુજરાતી Kreyòl ayisyen Hausa עברית עברית Otjiherero हिन्दी Hiri Motu Magyar Interlingua Bahasa Indonesia Originally called Occidental Gaeilge Asụsụ Igbo Iñupiaq Ido Íslenska Italiano ᐃᓄᒃᑎᑐᑦ 日本語 basa Jawa kalaallisut ಕನ್ನಡ Kanuri कश्मीरी Қазақ тілі ភាសាខ្មែរ Gĩkũyũ Ikinyarwanda кыргыз тили коми кыв KiKongo 한국어 كوردی‎ Kuanyama latine Lëtzebuergesch Luganda Limburgs Lingála ພາສາລາວ lietuvių kalba Luba-Katanga latviešu valoda Gaelg македонски јазик Malagasy fiteny بهاس ملايو‎ മലയാളം Malti te reo Māori मराठी Kajin M̧ajeļ монгол Ekakairũ Naoero Dinékʼehǰí Norsk bokmål isiNdebele नेपाली Owambo Norsk nynorsk Norsk ꆈꌠ꒿ Nuosuhxop isiNdebele Occitan ᐊᓂᔑᓈᐯᒧᐎᓐ ѩзыкъ словѣньскъ Afaan Oromoo ଓଡ଼ିଆ ирон æвзаг ਪੰਜਾਬੀ पाऴि فارسی polski پښتو Português Runa Simi rumantsch grischun kiRundi română русский язык संस्कृतम् sardu سنڌي، سندھی‎ Davvisámegiella gagana faa Samoa yângâ tî sängö српски језик Gàidhlig chiShona සිංහල slovenčina slovenščina Soomaaliga Sesotho español Basa Sunda Kiswahili SiSwati svenska தமிழ் తెలుగు تاجیکی‎ ไทย ትግርኛ བོད་ཡིག Türkmen Wikang Tagalog Setswana faka Tonga Türkçe Xitsonga تاتارچا‎ Twi Reo Tahiti ئۇيغۇرچە‎ українська اردو أۇزبېك‎ Tshivenḓa Tiếng Việt Volapük Walon Cymraeg Wollof Frysk isiXhosa ייִדיש Yorùbá Saɯ cueŋƅ аҧсуа Afaraf Afrikaans Akan Shqip አማርኛ العربية Aragonés Հայերեն অসমীয়া авар мацӀ avesta aymar aru azərbaycan dili bamanankan башҡорт теле euskara Беларуская বাংলা भोजपुरी Bislama bosanski jezik brezhoneg български език ဗမာစာ Català Chamoru нохчийн мотт chiCheŵa 中文 чӑваш чӗлхи Kernewek corsu ᓀᐦᐃᔭᐍᐏᐣ hrvatski česky dansk ދިވެހި Nederlands English Esperanto eesti Eʋegbe føroyskt vosa Vakaviti suomi français Fulfulde Galego ქართული Deutsch Ελληνικά Avañeẽ ગુજરાતી Kreyòl ayisyen Hausa עברית עברית Otjiherero हिन्दी Hiri Motu Magyar Interlingua Bahasa Indonesia Originally called Occidental Gaeilge Asụsụ Igbo Iñupiaq Ido Íslenska Italiano ᐃᓄᒃᑎᑐᑦ 日本語 basa Jawa kalaallisut ಕನ್ನಡ Kanuri कश्मीरी Қазақ тілі ភាសាខ្មែរ Gĩkũyũ Ikinyarwanda кыргыз тили коми кыв KiKongo 한국어 كوردی‎ Kuanyama latine Lëtzebuergesch Luganda Limburgs Lingála ພາສາລາວ lietuvių kalba Luba-Katanga latviešu valoda Gaelg македонски јазик Malagasy fiteny بهاس ملايو‎ മലയാളം Malti te reo Māori मराठी Kajin M̧ajeļ монгол Ekakairũ Naoero Dinékʼehǰí Norsk bokmål isiNdebele नेपाली Owambo Norsk nynorsk Norsk ꆈꌠ꒿ Nuosuhxop isiNdebele Occitan ᐊᓂᔑᓈᐯᒧᐎᓐ ѩзыкъ словѣньскъ Afaan Oromoo ଓଡ଼ିଆ ирон æвзаг ਪੰਜਾਬੀ पाऴि فارسی polski پښتو Português Runa Simi rumantsch grischun kiRundi română русский язык संस्कृतम् sardu سنڌي، سندھی‎ Davvisámegiella gagana faa Samoa yângâ tî sängö српски језик Gàidhlig chiShona සිංහල slovenčina slovenščina Soomaaliga Sesotho español Basa Sunda Kiswahili SiSwati svenska தமிழ் తెలుగు تاجیکی‎ ไทย ትግርኛ བོད་ཡིག Türkmen Wikang Tagalog Setswana faka Tonga Türkçe Xitsonga تاتارچا‎ Twi Reo Tahiti ئۇيغۇرچە‎ українська اردو أۇزبېك‎ Tshivenḓa Tiếng Việt Volapük Walon Cymraeg Wollof Frysk isiXhosa ייִדיש Yorùbá Saɯ cueŋƅ
...