A302090 Numbers k such that 6*k^k + 5 is prime.

0, 1, 2, 3, 6, 7, 134, 533, 2911, 4351

Offset

1,3

Comments

a(11) > 50000. - Robert Price, Feb 16 2020

Links

Table of n, a(n) for n=1..10.

Prog

(PARI) for(n=0, 500, if(isprime(6*n^n+5), print1(n", ")))

Crossrefs

Numbers k such that b*k^k + b - 1 is prime: A110932 (b=2), A160360 (b=3), A301520 (b=4), A302088 (b=5), this sequence (b=6).

Cf. A302091.

Sequence in context: A070301 A329294 A291659 * A088414 A375702 A133441

Adjacent sequences: A302087 A302088 A302089 * A302091 A302092 A302093

Keyword

nonn,more,hard

Author

Seiichi Manyama, Apr 01 2018

Extensions

a(8) from Jon E. Schoenfield, Apr 01 2018

a(9)-a(10) from Vaclav Kotesovec, Apr 01 2018

Status

approved