A076681 Numbers k such that 5*k! + 1 is prime.

2, 3, 5, 10, 11, 12, 17, 34, 74, 136, 155, 259, 271, 290, 352, 479, 494, 677, 776, 862, 921, 932, 2211, 3927, 4688, 12567

Offset

1,1

Comments

a(26) > 4700. - Jinyuan Wang, Feb 04 2020

Links

Table of n, a(n) for n=1..26.

Example

k = 3 is here because 5*3! + 1 = 31 is prime.

Prog

(PARI) is(k) = ispseudoprime(5*k!+1); \\ Jinyuan Wang, Feb 04 2020

Crossrefs

Cf. A002981, A051915, A076679, A076680, A076682, A076683, A178488, A180626, A126896.

Sequence in context: A288244 A246392 A219860 * A047604 A104427 A259732

Adjacent sequences: A076678 A076679 A076680 * A076682 A076683 A076684

Keyword

nonn,more

Author

Phillip L. Poplin (plpoplin(AT)bellsouth.net), Oct 25 2002

Extensions

a(25) from Jinyuan Wang, Feb 04 2020

a(26) from Michael S. Branicky, Jul 03 2024

Status

approved