A328217 Numbers k such that k^(k+1)*(k+1)^k + 1 is prime.

1, 2, 14, 22, 120

Offset: 1

Author

Juri-Stepan Gerasimov, Oct 08 2019

Keywords

• nonn
• more

Comments

a(6) > 10^3.

Numbers k such that A051443(k)+1 is prime. - Michel Marcus, Oct 08 2019

a(6) > 10^4, if it exists. - Michael S. Branicky, Aug 24 2024

Crossrefs

Cf. A000040, A051443.

Programs

Magma

[n: n in [1..500] | IsPrime(n^(n+1)*(n+1)^n+1)];

Mathematica

Select[Range[120], PrimeQ[#^(# + 1)*(# + 1)^# + 1] &] (* Amiram Eldar, Oct 08 2019 *)