A344361 Primes p such that (2^p-2)/p - 1 is prime.
5, 7, 349, 1123, 25447
Offset: 1
Examples
7 is a term because (2^7-2)/7 - 1 = 17 is prime.
Programs
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PARI
is(p) = isprime(p) && ispseudoprime((2^p-2)/p-1) \\ Jinyuan Wang, May 15 2021
Extensions
a(5) from Hugo Pfoertner, May 17 2021
Comments