A332763 Numbers k such that 6*17^k + 1 is prime.

0, 1, 5, 7, 19, 23, 67, 107, 400, 429, 617, 743, 1065, 7717, 12329, 14459, 22425, 114543, 221983, 237453

Offset: 1

Author

Paul S. Vanderveen, Feb 22 2020

Keywords

• nonn
• more

Comments

a(21) > 3.75*10^5. - Paul S. Vanderveen, Jul 05 2020

Crossrefs

Cf. A141797.

Programs

Mathematica

Select[Range[0, 1000], PrimeQ[6*17^# + 1] &] (* Amiram Eldar, Feb 24 2020 *)

PARI

for(i=1,10000, if( ispseudoprime(6*17^i+1), print1(i, ", ")));

Extensions

a(19) from Paul S. Vanderveen, Mar 09 2020

a(20) from Paul S. Vanderveen, Mar 15 2020