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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