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2. Table of prime factors - Wikipedia

   en.wikipedia.org/wiki/Table_of_prime_factors

   Download as PDF; Printable version; In other projects ... 1, 4, 9, 16, 25, 36, 49, 64, 81 ... A factorial x! is the product of all numbers from 1 to x. The first: 1 ...

3. List of prime numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_prime_numbers

   Download as PDF; Printable version ... Primes p that divide 2 n − 1, for some prime number n. 3 ... As of 2018, these are all known Wieferich primes with a ≤ 25 ...

4. List of numbers - Wikipedia, the free encyclopedia

   en.wikipedia.org/wiki/List_of_numbers

   A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

5. List of numeral systems - Wikipedia

   en.wikipedia.org/wiki/List_of_numeral_systems

   Such method is 6.7% more efficient than MIME-64 which encodes a 24 bit number into 4 printable characters. 89: Largest base for which all left-truncatable primes are known. 90: Nonagesimal: Related to Goormaghtigh conjecture for the generalized repunit numbers (111 in base 90 = 1111111111111 in base 2). 95: Number of printable ASCII characters ...

6. 25 (number) - Wikipedia

   en.wikipedia.org/wiki/25_(number)

   25 is the sum of the five consecutive single-digit odd natural numbers 1, 3, 5, 7, and 9. 25 is a centered octagonal number, [1] a centered square number, [2] a centered octahedral number, [3] and an automorphic number. [4] 25 percent (%) is equal to ⁠ 1 / 4 ⁠. It is the smallest decimal Friedman number as it can be expressed by its own ...

7. Timeline of numerals and arithmetic - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_numerals_and...

   Download as PDF; Printable version; ... as the earliest reference to prime numbers as also a common number. [1] ... 25 (UTC). Text is available ...

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9. Pronic number - Wikipedia

   en.wikipedia.org/wiki/Pronic_number

   Thus a pronic number is squarefree if and only if n and n + 1 are also squarefree. The number of distinct prime factors of a pronic number is the sum of the number of distinct prime factors of n and n + 1. If 25 is appended to the decimal representation of any pronic number, the result is a square number, the square of a number ending on 5; for ...