I am having trouble with proving this particular congruence. n^21 is congruent to n(mod 30)
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Originally Posted by meshel88 I am having trouble with proving this particular congruence. n^21 is congruent to n(mod 30) What have you tried?
I know that I have to prove that 2,3,5 divide n^21-n but that is where I get stuck.
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