I am having trouble with proving this particular congruence.

n^21 is congruent to n(mod 30)

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- Mar 1st 2010, 02:19 PMmeshel88proving congruences
I am having trouble with proving this particular congruence.

n^21 is congruent to n(mod 30) - Mar 1st 2010, 02:20 PMDrexel28
- Mar 1st 2010, 02:42 PMmeshel88
I know that I have to prove that 2,3,5 divide n^21-n but that is where I get stuck.