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2. Factorion - Wikipedia

   en.wikipedia.org/wiki/Factorion

   Let be a natural number. For a base >, we define the sum of the factorials of the digits [5] [6] of , :, to be the following: ⁡ = =!. where = ⌊ ⁡ ⌋ + is the number of digits in the number in base , ! is the factorial of and

3. Factorial number system - Wikipedia

   en.wikipedia.org/wiki/Factorial_number_system

   The factorial number system is sometimes defined with the 0! place omitted because it is always zero (sequence A007623 in the OEIS). In this article, a factorial number representation will be flagged by a subscript "!". In addition, some examples will have digits delimited by a colon. For example, 3:4:1:0:1:0! stands for

4. Table of prime factors - Wikipedia

   en.wikipedia.org/wiki/Table_of_prime_factors

   A sphenic number has Ω(n) = 3 and is square-free (so it is the product of 3 distinct primes). The first: 30, 42, 66, 70, 78, 102, 105, 110, 114, 130, 138, 154 (sequence A007304 in the OEIS ). a 0 ( n ) is the sum of primes dividing n , counted with multiplicity.

5. Factorial - Wikipedia

   en.wikipedia.org/wiki/Factorial

   In mathematics, the factorial of a non-negative integer, denoted by !, is the product of all positive integers less than or equal to . The factorial of also equals the product of with the next smaller factorial: ! = () = ()! For example, ! =! = =

6. Factorial prime - Wikipedia

   en.wikipedia.org/wiki/Factorial_prime

   (resulting in 24 factorial primes - the prime 2 is repeated) No other factorial primes are known as of December 2024 [update] . When both n ! + 1 and n ! − 1 are composite , there must be at least 2 n + 1 consecutive composite numbers around n !, since besides n ! ± 1 and n ! itself, also, each number of form n ! ± k is divisible by k for 2 ...

7. Integer factorization - Wikipedia

   en.wikipedia.org/wiki/Integer_factorization

   In mathematics, integer factorization is the decomposition of a positive integer into a product of integers. Every positive integer greater than 1 is either the product of two or more integer factors greater than 1, in which case it is a composite number, or it is not, in which case it is a prime number.