A173974 Numbers k such that k^k + 43 is prime.

2, 8, 14, 26, 84, 574

Offset

1,1

Comments

a(7) > 3000. - Daniel Starodubtsev, Aug 06 2019

a(7) > 20000. - Michael S. Branicky, May 22 2026

Links

Table of n, a(n) for n=1..6.

Example

2^2 + 43 = 47, which is prime, so 2 is in the sequence.

Mathematica

f[n_]:=PrimeQ[n^n+43]; lst={}; Do[If[f[n], AppendTo[lst, n]], {n, 6!}]; lst

Prog

(PARI) is(n)=ispseudoprime(n^n+43) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A100837, A100838, A100839.

Sequence in context: A295055 A277276 A324785 * A056677 A053697 A092346

Adjacent sequences: A173971 A173972 A173973 * A173975 A173976 A173977

Keyword

nonn,more

Author

Vladimir Joseph Stephan Orlovsky, Mar 03 2010

Status

approved