How to prove that one of $2,3,6$ is a square modulo every prime $p$?
I am thinking in terms of quadratic reciprocity but not getting any clue.
2026-04-14 23:59:11.1776211151
How to prove that one of $2,3,6$ is a square modulo every prime $p$?
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what is $$ (2|p) (3|p)(6|p) \; ? $$