Math
posted by Emma .
Is 28851 a prime number?

Math 
Count Iblis
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

Math 
Reiny
nope, it is divisible by 3
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