A302124 -id:A302124 - cp's OEIS frontend

A302123 Numbers k such that 6*k^k - 5 is prime.

2, 3, 4, 7, 8, 9, 33, 138, 251, 467, 489, 9894

Offset: 1

Seiichi Manyama, Apr 01 2018

a(13) > 50000. - Robert Price, Jan 04 2020

Numbers k such that b*k^k - b + 1 is prime: A301521 (b=4), this sequence (b=6).

Cf. A302090, A302124.

Select[Range[1, 1000], PrimeQ[6*#^# - 5] &] (* Vaclav Kotesovec, Apr 02 2018 *)

for(n=0, 300, if(isprime(6*n^n-5), print1(n", ")))

a(10)-a(11) from Vaclav Kotesovec, Apr 02 2018

a(12) from Robert Price, Jan 04 2020

A302137 Primes of form 10*k^k - 9.

Original entry on oeis.org

31, 2551, 111120068255580151

Offset: 1

Seiichi Manyama, Apr 02 2018

nonn

The next term is too large to include.

Primes of form b*k^k - b + 1: A301870 (b=4), A302124 (b=6), A302135 (b=9), this sequence (b=10).

Cf. A302136.

a(n) = 10*A302136(n)^A302136(n) - 9.

A302135 Primes of form 9*k^k - 8.

Original entry on oeis.org

7411879, 3486784393, 2567805035491

Offset: 1

Seiichi Manyama, Apr 02 2018

nonn

The next term is too large to include.

Primes of form b*k^k - b + 1: A301870 (b=4), A302124 (b=6), this sequence (b=9), A302137 (b=10).

Cf. A302134.

a(n) = 9*A302134(n)^A302134(n) - 8.

cp's OEIS Frontend

A302123 Numbers k such that 6*k^k - 5 is prime.

Views

Author

Keywords

Comments

Crossrefs

Programs

Mathematica

PARI

Extensions

A302137 Primes of form 10*k^k - 9.

Views

Author

Keywords

Comments

Crossrefs

Formula

A302135 Primes of form 9*k^k - 8.

Views

Author

Keywords

Comments

Crossrefs

Formula