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  2. Pólya conjecture - Wikipedia

    en.wikipedia.org/wiki/Pólya_conjecture

    The Pólya conjecture states that for any n > 1, if the natural numbers less than or equal to n (excluding 0) are partitioned into those with an odd number of prime factors and those with an even number of prime factors, then the former set has at least as many members as the latter set. Repeated prime factors are counted repeatedly; for ...

  3. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Negative numbers: Real numbers that are less than zero. Because zero itself has no sign, neither the positive numbers nor the negative numbers include zero. When zero is a possibility, the following terms are often used: Non-negative numbers: Real numbers that are greater than or equal to zero. Thus a non-negative number is either zero or positive.

  4. Polignac's conjecture - Wikipedia

    en.wikipedia.org/wiki/Polignac's_conjecture

    [3] [4] Later that year, James Maynard announced a related breakthrough which proved that there are infinitely many prime gaps of some size less than or equal to 600. [5] As of April 14, 2014, one year after Zhang's announcement, according to the Polymath project wiki , n has been reduced to 246. [ 6 ]

  5. Sieve of Eratosthenes - Wikipedia

    en.wikipedia.org/wiki/Sieve_of_Eratosthenes

    A prime number is a natural number that has exactly two distinct natural number divisors: the number 1 and itself. To find all the prime numbers less than or equal to a given integer n by Eratosthenes' method: Create a list of consecutive integers from 2 through n: (2, 3, 4, ..., n). Initially, let p equal 2, the smallest prime number.

  6. List of integer sequences - Wikipedia

    en.wikipedia.org/wiki/List_of_integer_sequences

    A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. ... Number of odd entries in row ... A prime number that is ...

  7. Scientists find when in life people are most likely to sleep ...

    www.aol.com/news/scientists-life-people-most...

    People in the UK reported sleeping slightly less than the average, according to the study

  8. Natural number - Wikipedia

    en.wikipedia.org/wiki/Natural_number

    It follows from the definition that each natural number is equal to the set of all natural numbers less than it. This definition, can be extended to the von Neumann definition of ordinals for defining all ordinal numbers, including the infinite ones: "each ordinal is the well-ordered set of all smaller ordinals."

  9. Study shows women need more sleep than men because their ...

    www.aol.com/news/2016-03-11-study-shows-women...

    A scientific study has proven that women legitimately need more sleep than men. Professor Jim Horne, director of Loughborough University's Sleep Research Centre, explains that "for women, ...