A358805 Numbers k such that k! + (k!/2) + 1 is prime.

4, 5, 7, 11, 12, 14, 18, 28, 30, 62, 135, 153, 275, 584, 630, 1424, 1493, 4419, 8492, 10950

Offset

1,1

Comments

Numbers k such that A070960(k)+1 is prime.

No more terms < 10000. - Vaclav Kotesovec, Dec 12 2022

Links

Table of n, a(n) for n = 1..19

Arsen Vardanyan, A list of prime numbers

Prog

(PARI) is(k) = isprime(k!+(k!/2)+1);

Crossrefs

Cf. A070960, A358878.

Sequence in context: A074300 A344157 A047375 * A005487 A291741 A084087

Adjacent sequences: A358802 A358803 A358804 * A358806 A358807 A358808

Keyword

nonn,more

Author

Arsen Vardanyan, Dec 01 2022

Extensions

a(18)-a(19) from Vaclav Kotesovec, Dec 09 2022

a(20) from Michael S. Branicky, Aug 02 2024

Status

approved