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  2. Powerful number - Wikipedia

    en.wikipedia.org/wiki/Powerful_number

    A powerful number is a positive integer m such that for every prime number p dividing m, p 2 also divides m.Equivalently, a powerful number is the product of a square and a cube, that is, a number m of the form m = a 2 b 3, where a and b are positive integers (in some cases, the cube is 1).

  3. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    918,082: the number of digits is even (6) → 1808 + 9 − 2 = 1815: 81 + 1 − 5 = 77 = 7 × 11 If the number of digits is odd, subtract the first and last digit from the rest. The result must be divisible by 11. 14,179: the number of digits is odd (5) → 417 − 1 − 9 = 407 = 37 × 11 12: It is divisible by 3 and by 4.

  4. Sieve of Eratosthenes - Wikipedia

    en.wikipedia.org/wiki/Sieve_of_Eratosthenes

    Sieve of Eratosthenes: algorithm steps for primes below 121 (including optimization of starting from prime's square). In mathematics, the sieve of Eratosthenes is an ancient algorithm for finding all prime numbers up to any given limit.

  5. Weird number - Wikipedia

    en.wikipedia.org/wiki/Weird_number

    In number theory, a weird number is a natural number that is abundant but not semiperfect. [1] [2] In other words, the sum of the proper divisors (divisors including 1 but not itself) of the number is greater than the number, but no subset of those divisors sums to the number itself.

  6. List of organisms by chromosome count - Wikipedia

    en.wikipedia.org/wiki/List_of_organisms_by...

    The list of organisms by chromosome count describes ploidy or numbers of chromosomes in the cells of various plants, animals, protists, and other living organisms.This number, along with the visual appearance of the chromosome, is known as the karyotype, [1] [2] [3] and can be found by looking at the chromosomes through a microscope.

  7. 127 (number) - Wikipedia

    en.wikipedia.org/wiki/127_(number)

    127 is equal to (), where () is the n th prime number. 127 is the number of non-equivalent ways of expressing 10,000 as the sum of two prime numbers [10] 127/50 = 2.54, the number of centimeters in one inch.

  8. Goldbach's weak conjecture - Wikipedia

    en.wikipedia.org/wiki/Goldbach's_weak_conjecture

    For if every even number greater than 4 is the sum of two odd primes, adding 3 to each even number greater than 4 will produce the odd numbers greater than 7 (and 7 itself is equal to 2+2+3). In 2013, Harald Helfgott released a proof of Goldbach's weak conjecture.

  9. Nim - Wikipedia

    en.wikipedia.org/wiki/Nim

    The normal play strategy would be to take 1 from B, leaving an even number (2) heaps of size 1. For misère play, I take the entire B heap, to leave an odd number (1) of heaps of size 1. 0: 0: 1: 001 2 =1 10: You take 1 from C, and lose.

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