[seqfan] Problem

Tomasz Ordowski tomaszordowski at gmail.com
Sat Jul 18 21:01:36 CEST 2020


Dear SeqFans!

Let a(0) = p and a(n) = 2 a(n-1) + 1. Note that a(n) = (p+1) 2^n - 1.
Are there primes p such that a(n) is composite for every n > 0 ?

Best regards,

Thomas Ordowski
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https://en.wikipedia.org/wiki/Riesel_number



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