A051420 Numbers k such that A000081(k) is prime.

3, 10, 15, 343, 387, 1087, 2981, 96761

Offset: 1

Author

David Broadhurst

Keywords

• nonn
• more

Comments

A000081(2981) = O(10^1400) is only a probably prime. No more terms < 6000.

No more terms < 40000. - Vaclav Kotesovec, Jul 07 2020

A000081(96761) is a probable prime. No other terms < 100000. - Mathieu Gouttenoire, Oct 08 2021

Crossrefs

Cf. A000081, A119642, A185667, A336039.

Extensions

a(8) from Mathieu Gouttenoire, Oct 08 2021