A100849 Numbers k such that k^k + k + 5 is prime.

1, 2, 37, 451, 1699, 2131, 12612

Offset

1,2

Comments

Here we interpret 0^0 as 1.

a(7) > 10^4. [From D. S. McNeil, Mar 14 2009]

a(8) > 2*10^4. - Michael S. Branicky, Jun 30 2024

Links

Table of n, a(n) for n=1..7.

Prog

(PARI) f2(n) = for(x=0, n, y=x^x+x+5; if(ispseudoprime(y), print1(x", ")))

Crossrefs

Cf. A100848, A100850.

Sequence in context: A092853 A297796 A300542 * A300969 A120047 A300926

Adjacent sequences: A100846 A100847 A100848 * A100850 A100851 A100852

Keyword

hard,more,nonn

Author

Cino Hilliard, Jan 07 2005

Extensions

a(5)-a(6) from D. S. McNeil, Mar 14 2009

a(7) from Michael S. Branicky, Jun 29 2024

Status

approved