A141797 Numbers n such that 2*17^n + 1 is prime.

0, 47, 5991, 147459

Offset

1,2

Comments

Primes found and proved by PrimeForm. No more terms up to 20000.

a(5) > 2*10^5. - Robert Price, Jan 10 2016

a(5) > 10^6. - Paul S. Vanderveen, Oct 16 2020

Links

Table of n, a(n) for n=1..4.

Prog

(PARI) is(n) = ispseudoprime(2*17^n + 1); \\ Altug Alkan, Jan 10 2016

Crossrefs

Cf. A141774, A141798.

Sequence in context: A217229 A217230 A217231 * A101629 A362714 A267063

Adjacent sequences: A141794 A141795 A141796 * A141798 A141799 A141800

Keyword

nonn,bref,hard,more

Author

Rick L. Shepherd, Jul 04 2008

Extensions

a(4) from Robert Price, Jan 10 2016

Status

approved