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A174288 Primes p such that 8*2^(2p)-1 is also prime. 0

%I #4 Sep 08 2022 08:45:51

%S 2,5,7,29,43,1607

%N Primes p such that 8*2^(2p)-1 is also prime.

%C These are the primes in A139481. [From _R. J. Mathar_, Mar 17 2010]

%e For p=2, 8*2^4-1=127; p=5, 8*2^10-1=8191; p=7, 8*2^14-1=131071

%o (Magma) [p: p in PrimesUpTo(4500)| IsPrime(8*2^(2*p)-1)]

%K nonn

%O 1,1

%A _Vincenzo Librandi_, Mar 15 2010

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)