Posted by Emma on Sunday, June 24, 2012 at 10:39pm.
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
nope, it is divisible by 3
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