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A076682 Numbers k such that 6*k! + 1 is prime. 7
0, 1, 2, 3, 7, 8, 9, 12, 13, 18, 24, 38, 48, 60, 113, 196, 210, 391, 681, 739, 778, 1653, 1778, 1796, 1820, 2505, 4595 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(28) > 5800. - Jinyuan Wang, Feb 05 2020

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

k = 3 is here because 6*3! + 1 = 37 is prime.

PROG

(PARI) is(k) = ispseudoprime(6*k!+1); \\ Jinyuan Wang, Feb 05 2020

CROSSREFS

Cf. A002981, A051915, A076679, A076680, A076681, A076683, A178488, A180626, A126896.

Sequence in context: A268398 A249587 A007607 * A327224 A231624 A194381

Adjacent sequences:  A076679 A076680 A076681 * A076683 A076684 A076685

KEYWORD

nonn,more

AUTHOR

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

STATUS

approved

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Last modified June 4 11:09 EDT 2020. Contains 334825 sequences. (Running on oeis4.)