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Is 28851 a prime number?

  • Math -

    It is divisible by 3:

    10 Mod 3 = 1 ------>

    10^n Mod 3 = 1^n = 1 ------>

    Sum over cn 10^n Mod 3 =

    Sum over cn Mod 3


    28851 Mod 3 = (2 + 8 + 8 + 5 + 1) Mod 3

    = 0

  • Math -

    http://primes.utm.edu/lists/small/1000.txt

  • Math -

    nope, it is divisible by 3

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