[seqfan] Re: Verification: 13 is or is not a square modulo 26

Hugo Pfoertner yae9911 at gmail.com
Tue Nov 26 21:07:23 CET 2019


PARI/GP agrees with your result:
for(k=0,26,if(!issquare(Mod(k,26)),print1(k,", ")))
2, 5, 6, 7, 8, 11, 15, 18, 19, 20, 21, 24,

On Tue, Nov 26, 2019 at 4:58 PM Alonso Del Arte <alonso.delarte at gmail.com>
wrote:

> Just want to be sure to doublecheck this with at least one other person:
> the nonsquares modulo 26 are 2, 5, 6, 7, 8, 11, 15, 18, 19, 20, 21, 24. So
> 13 is not on the list because if x = 13 mod 26, then x^2 = 13 mod 26 also.
>
> Al
>
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> Seqfan Mailing list - http://list.seqfan.eu/
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