A344361 Primes p such that (2^p-2)/p - 1 is prime.

5, 7, 349, 1123, 25447

Offset: 1

Author

Jorge Coveiro, May 15 2021

Keywords

• nonn
• more

Comments

a(6) > 1199999, if it exists. - Karl-Heinz Hofmann, Jul 27 2021

Examples

			7 is a term because (2^7-2)/7 - 1 = 17 is prime.
		

Crossrefs

Cf. A064535, A344360.

Programs

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