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A100849
Numbers k such that k^k + k + 5 is prime.
2
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
PROG
(PARI) f2(n) = for(x=0, n, y=x^x+x+5; if(ispseudoprime(y), print1(x", ")))
CROSSREFS
Sequence in context: A092853 A297796 A300542 * A300969 A120047 A300926
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