A358878 - OEIS

A358878

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

2, 5, 7, 15, 20, 47, 84, 138, 169, 257, 263, 431, 559, 2939, 4403, 4870, 5273

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OFFSET

1,1

COMMENTS

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

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

LINKS

PROG

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

CROSSREFS

KEYWORD

nonn,more

AUTHOR

EXTENSIONS

a(14)-a(17) from Vaclav Kotesovec, Dec 07 2022

STATUS

approved