Posted by **Emma** on Sunday, June 24, 2012 at 10:39pm.

Is 28851 a prime number?

- Math -
**Count Iblis**, Sunday, June 24, 2012 at 10:47pm
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 -
**Ms. Sue**, Sunday, June 24, 2012 at 10:49pm
http://primes.utm.edu/lists/small/1000.txt

- Math -
**Reiny**, Sunday, June 24, 2012 at 11:03pm
nope, it is divisible by 3

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