$3$ is clearly an example, but I can't seem to find any other. How do I prove (or disprove) that $3$ is the unique solution?
2026-04-02 19:42:44.1775158964
Find all integers $n>1$ such that $n^2|2^n+1$.
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[Here is the answer] ( [PDF] an 소 1 - Yufei Zhao yufeizhao.com › exponent_lifting_sol). Go to answer 6.
It would be good if you learn LTE technique from a good resource if you are doing Olympiad problems. Maybe from here