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2. Table of divisors - Wikipedia

   en.wikipedia.org/wiki/Table_of_divisors

   d() is the number of positive divisors of n, including 1 and n itself; σ() is the sum of the positive divisors of n, including 1 and n itselfs() is the sum of the proper divisors of n, including 1 but not n itself; that is, s(n) = σ(n) − n

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4. List of prime numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_prime_numbers

   This is a list of articles about prime numbers. A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.

5. Table of prime factors - Wikipedia

   en.wikipedia.org/wiki/Table_of_prime_factors

   An economical number has been defined as a frugal number, but also as a number that is either frugal or equidigital. gcd( m , n ) ( greatest common divisor of m and n ) is the product of all prime factors which are both in m and n (with the smallest multiplicity for m and n ).

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7. Table of nuclides - Wikipedia

   en.wikipedia.org/wiki/Table_of_nuclides

   A chart or table of nuclides maps the nuclear, or radioactive, behavior of nuclides, as it distinguishes the isotopes of an element.It contrasts with a periodic table, which only maps their chemical behavior, since isotopes (nuclides that are variants of the same element) do not differ chemically to any significant degree, with the exception of hydrogen.

8. Pentagonal number - Wikipedia

   en.wikipedia.org/wiki/Pentagonal_number

   The nth pentagonal number p n is the number of distinct dots in a pattern of dots consisting of the outlines of regular pentagons with sides up to n dots, when the pentagons are overlaid so that they share one vertex. For instance, the third one is formed from outlines comprising 1, 5 and 10 dots, but the 1, and 3 of the 5, coincide with 3 of ...

9. 50 (number) - Wikipedia

   en.wikipedia.org/wiki/50_(number)

   Print/export Download as PDF ... ← 0 10 20 30 40 50 60 70 80 90 ... 50 is a Stirling number of the first kind and a Narayana number In science. The atomic ...