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  2. Table of prime factors - Wikipedia

    en.wikipedia.org/wiki/Table_of_prime_factors

    The first: 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 3628800, 39916800, 479001600 (sequence A000142 in the OEIS). 0! = 1 is sometimes included. A k-smooth number (for a natural number k) has its prime factors ≤ k (so it is also j-smooth for any j > k). m is smoother than n if the largest prime factor of m is below the largest of n.

  3. Prime number - Wikipedia

    en.wikipedia.org/wiki/Prime_number

    The same prime factor may occur more than once; this example has two copies of the prime factor When a prime occurs multiple times, exponentiation can be used to group together multiple copies of the same prime number: for example, in the second way of writing the product above, 5 2 {\displaystyle 5^{2}} denotes the square or second power of 5 ...

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  5. 120 (number) - Wikipedia

    en.wikipedia.org/wiki/120_(number)

    The sum of its factors (including one and itself) sum to 360, exactly three times 120. Perfect numbers are order two ( 2-perfect ) by the same definition. 120 is the sum of a twin prime pair (59 + 61) and the sum of four consecutive prime numbers (23 + 29 + 31 + 37), four consecutive powers of two (8 + 16 + 32 + 64), and four consecutive powers ...

  6. Taxman (mathematical game) - Wikipedia

    en.wikipedia.org/wiki/Taxman_(mathematical_game)

    In some versions, the taxman may neglect to collect all of the factors of the tax payer's number, or may attempt to collect a factor incorrectly. The taxman may or may not lose points for missing factors or choosing incorrectly, and the tax payer may or may not be able to steal a factor that the taxman misses. [4] [5] [6] [8]

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  8. Number Munchers - Wikipedia

    en.wikipedia.org/wiki/Number_Munchers

    Number Munchers is an educational video game and a spin-off of Word Munchers.It was released by MECC for Apple II in 1986, then MS-DOS and Mac in 1990. The concept of the game was designed by R. Philip Bouchard, who also designed The Oregon Trail.

  9. Composite number - Wikipedia

    en.wikipedia.org/wiki/Composite_number

    If none of its prime factors are repeated, it is called squarefree. (All prime numbers and 1 are squarefree.) For example, 72 = 2 3 × 3 2, all the prime factors are repeated, so 72 is a powerful number. 42 = 2 × 3 × 7, none of the prime factors are repeated, so 42 is squarefree. Euler diagram of numbers under 100: