Answer to Is (2^n)-1 always prime when n is an odd number? Are there any counterexamples? Could the statement be proved? by Alon Amit (אלון עמית) https://www.quora.com/Is-2-n-1-always-prime-when-n-is-an-odd-number-Are-there-any-counterexamples-Could-the-statement-be-proved/answer/Alon-Amit?ch=18&oid=208272882&share=21eee396&srid=hIX1P&target_type=answer
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