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

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

Offset: 1

Author

Seiichi Manyama, Apr 01 2018

Keywords

• nonn
• more
• hard

Comments

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

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.

Programs

PARI

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

Extensions

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

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