A086218 Primes p such that 3^p - 2 is prime.

2, 5, 37, 41, 317, 541, 2521

Offset: 1

Author

Cino Hilliard, Aug 28 2003

Keywords

• nonn
• hard
• more

Comments

a(8) > 1180181, if it exists (based on the data at A014224). - Amiram Eldar, Jul 07 2024

Crossrefs

Subsequence of prime terms of A014224.

Cf. A086214, A089919.

Programs

Mathematica

f[n_]:=3^n-2; lst={};Do[p=Prime[n];If[PrimeQ[f[p]],Print[p];AppendTo[lst,p]],{n,7!}];lst (* Vladimir Joseph Stephan Orlovsky, Jul 17 2009 *)

Formula

a(n) = prime(A089919(n)). - Amiram Eldar, Jul 07 2024

Extensions

a(7) from Jorge Coveiro, Apr 10 2004