A100850 Numbers k such that k^k + k + 7 is prime.

2, 3, 5, 53, 164, 806, 1256

Offset

1,1

Comments

Here we interpret 0^0 as 1.

a(8) > 3340. - Daniel Starodubtsev, Mar 05 2019

a(8) > 20000. - Michael S. Branicky, Jun 29 2024

Links

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

Prog

(PARI) f2(n) = for(x=0, n, y=x^x+x+7; if(ispseudoprime(y), print1(x", ")))

Crossrefs

Cf. A100848, A100849.

Sequence in context: A041791 A322947 A056720 * A309607 A060085 A114370

Adjacent sequences: A100847 A100848 A100849 * A100851 A100852 A100853

Keyword

hard,more,nonn

Author

Cino Hilliard, Jan 07 2005

Extensions

a(6)-a(7) from Daniel Starodubtsev, Mar 05 2019

Status

approved