I am trying to find n such that is divisible by 13. I am trying to let and which gives . But I end up running in circles and getting nowhere! Any ideas?
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And this cycle repeats. So we know the least residues of (mod 13) for all is 3, 9, or 1. Since implies , we have to find such that . As it turns out, 2 is a primitive root modulo 13. So see for which such that . See if you can figure it out from here.
great that worked! I just determined the reside system for and then checked for what values of n, their sum added appropriately! Merci
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