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Answers and rating deltas for

What is wrong in this code for checking if a number is a prime?

Author Votes Δ
motoku 2 +3.76
MadProgrammer 2 +0.18
Joost 1 +0.95
Durwasa Chakraborty 0 -2.11
niiraj874u 0 -1.83
Mathias Lavaert 0 -2.19
Last visited: Sep 14, 2014, 5:07:29 AM