In mathematics, a Wilson prime is a certain kind of prime number. A prime p is called a Wilson prime if p² divides (p − 1)! + 1, where ! denotes the factorial function; compare this with Wilson's theorem, which states that every prime p divides (p − 1)! + 1. The only known Wilson primes are 5, 13, and 563 (sequence A007540 in OEIS); if any others exist, they must be greater than 5 · 108. It has been conjectured that infinitely many Wilson primes exist, and that the number of Wilson primes in an interval [x, ...

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See also Thirteen, a 2003 movie, 13 an album by British band Blur, Thirteen an album by Teenage Fanclub. 13 (thirteen) is the natural number following 12 and preceding 14. << 10 11 12 13 14 15 16 17 18 19 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> 13 number - In mathematics. Thirteen is the 6th smallest prime number; the next is seventeen. 13 is the second Wilson prim ...

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0 1 2 3 4 5 6 7 8 9 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >> quinque-/quinqu-/quint- (from Latin) 5 (five) is a number, numeral, and glyph. It is the natural number following 4 and preceding 6. The SI prefix for 10005 is peta (P), and for its reciprocal femto (f). 5 number - In mathematics. Five is the third smallest prime number, after 2 and 3, and before 7. Because it can b ...

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Five hundred is the natural number following four hundred and ninety-nine and preceding five hundred and one. << 0 100 200 300 400 500 600 700 800 900 >> 500 number - Mathematical properties. 500 is a Harshad number. 500 number - Other fields. Five hundred is also a car, the Ford Five Hundred a card game, see 500 (card game) an outdoor ball/frisbee game, ...

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List of number theory topics - Primality tests. Prime factorization algorithm Trial division Sieve of Eratosthenes Probabilistic algorithm Fermat primality test Pseudoprime Carmichael number Euler pseudoprime Euler-Jacobi pseudoprime Fibonacci pseudoprime Probable prime Miller-Rabin primality test Lucas-Lehmer primality test Lucas-Lehmer test for Mersenne numbers AKS prim ...

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List of number theory topics, List of number theory topics - Factors, List of number theory topics - Fractions, List of number theory topics - Modular arithmetic, List of number theory topics - Arithmetic functions, List of number theory topics - Analytic number theory: additive problems, List of number theory topics - Algebraic number theory, List of number theory topics - Quadratic forms, List of number theory topics - L-functions, List of number theory topics - Diophantine equations, List of number theory topics - Diophantine approximation, List of number theory topics - Sieve methods, List of number theory topics - Named primes, List of number theory topics - Combinatorial number theory, List of number theory topics - Computational number theory, List of number theory topics - Primality tests, List of number theory topics - Integer factorization, List of number theory topics - Pseudo-random numbers, List of number theory topics - History

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Thirteen is regarded as an unlucky number in many cultures. One (probably unverifiable) theory holds that 13 is a reflection of the human fear of the unknown, since it is the first number that cannot be enumerated by using our 10 fingers and 2 feet. Unreasoned fear of the number 13 is termed triskaidekaphobia. Due to this fear, some tall buildings have resorted to skipping the "thirteenth floor", simply by numbering it "14" (though it's really still the thirteenth floor) or by designating the floor "12a" or similar instead. The thirteenth of ...

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Five is the third smallest prime number, after 2 and 3, and before 7. Because it can be written as 2^(2^1)+1, five is classified as a Fermat prime. 5 is the third Sophie Germain prime, the first safe prime, and the third Mersenne prime exponent. Five is the first Wilson prime and the third factorial prime, also an alternating factorial. It is an Eisenstein prime with no imaginary part and real part of the form See also:

5 number, 5 number - In mathematics, 5 number - In numbering systems, 5 number - The Arabic glyph, 5 number - In science, 5 number - In astronomy, 5 number - In various cultures, 5 number - In music, 5 number - In sports, 5 number - In technology, 5 number - In other fields, 5 number - Years

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Thirteen is regarded as an unlucky number in many cultures. One (probably unverifiable) theory holds that 13 is a reflection of the human fear of the unknown, since it is the first number that cannot be enumerated by using our 10 fingers and 2 feet. Unreasoned fear of the number 13 is termed triskaidekaphobia. Due to this fear, some tall buildings have resorted to skipping the "thirteenth floor", simply by numbering it "14" (though it's really still the thirteenth floor) or by designating the floor "12a" or similar instead. The thirteenth of ...

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The evolution of our modern glyph for five cannot be neatly traced back to the Brahmin Indians quite the same way it can for 1 to 4. Later on the Kushana and Gupta Indians had among themselves several different glyphs which bear no resemblance to the modern glyph. The Nagari and Punjabi took these glyphs and all came up with glyphs that look like a lowercase "h" rotated 180°. The Ghubar Arabs transformed the glyph in several different ways, coming up with glyphs that look more like 4s or 3s than 5s. It was from those characters that ...

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5 number, 5 number - In mathematics, 5 number - In numbering systems, 5 number - The Arabic glyph, 5 number - In science, 5 number - In astronomy, 5 number - In various cultures, 5 number - In music, 5 number - In sports, 5 number - In technology, 5 number - In other fields, 5 number - Years

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5 number - In astronomy. Messier object M5, a magnitude 7.0 globular cluster in the constellation Serpens. The New General Catalogue object NGC 5, a magnitude 13 spiral galaxy in the constellation Andromeda The Saros number of the solar eclipse series which began on April 4, 2720 BC and ended on May 24, 1422 BC. The duration of Saros series 5 was 1298.1 years, and it contained 73 solar eclipses. The Saros number of the lunar eclipse series which began on -2581 October 8 and ended ...

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5 number, 5 number - In mathematics, 5 number - In numbering systems, 5 number - The Arabic glyph, 5 number - In science, 5 number - In astronomy, 5 number - In various cultures, 5 number - In music, 5 number - In sports, 5 number - In technology, 5 number - In other fields, 5 number - Years

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Thirteen is the 6th smallest prime number; the next is seventeen. 13 is the second Wilson prime. 13 is the fifth Mersenne prime exponent, yielding 8191. 13 is also the third lucky prime. 13 is the second star number and the seventh Fibonacci number. As it is an odd-indexed Fibonacci number, it is a Markov number, appearing in solutions to the Markov Diophantine equation: (1, 5, 13), (1, 13, 34), (5, 13, 194), ... There are 13 Archimedean solids. 13 goes into 999,999 exactly 76,923 times, so vulgar fractions with 13 in the denominator have six digit repe ...

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