A173975 Numbers k such that k^k + 115 is prime.

6, 8, 18, 36, 38, 176

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, Mar 03 2010

Keywords

• nonn
• hard
• more

Comments

a(7) > 3000. - Daniel Starodubtsev, Aug 05 2019

a(7) > 30000. - Michael S. Branicky, Nov 30 2024

Crossrefs

Cf. A100837, A100838, A100839, A173974.

Programs

Mathematica

f[n_]:=PrimeQ[n^n+115];lst={};Do[If[f[n],AppendTo[lst,n]],{n,6!}];lst

PARI

is(n)=ispseudoprime(n^n+115) \\ Charles R Greathouse IV, Jun 13 2017