A137236 Numbers k such that 13^k + 4 is prime.

0, 1, 2, 6, 10, 15, 94, 198, 219, 4543, 11511, 12638, 45606

Offset

1,3

Comments

a(14) > 10^5. - Tyler NeSmith, May 09 2021

Links

Table of n, a(n) for n=1..13.

Henri Lifchitz and Renaud Lifchitz, PRP Records.

Prog

(PARI) for(n=0, 300, if(isprime(13^n+4), print1(n", ")))

Crossrefs

Sequence in context: A369237 A097022 A370114 * A124198 A032426 A220453

Adjacent sequences: A137233 A137234 A137235 * A137237 A137238 A137239

Keyword

hard,more,nonn

Author

Jason Earls, Mar 08 2008

Extensions

a(13) from Lelio R. Paula contributed by Iain Fox, Nov 24 2017

Status

approved