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A126896 Numbers k such that 10*k! + 1 is prime. 9
0, 1, 3, 4, 5, 23, 32, 39, 61, 349, 718, 805, 1025, 1194, 1550, 1774 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(17) > 2880. - Jinyuan Wang, Feb 05 2020

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

k = 4 is here because 10*4! + 1 = 241 is prime.

PROG

(PARI) is(k) = ispseudoprime(10*k!+1); \\ Jinyuan Wang, Feb 05 2020

CROSSREFS

Cf. A002981, A051915, A076679, A076680, A076681, A076682, A076683, A178488, A180626.

Sequence in context: A037347 A116474 A208807 * A334225 A123957 A085285

Adjacent sequences:  A126893 A126894 A126895 * A126897 A126898 A126899

KEYWORD

nonn,more

AUTHOR

Parthasarathy Nambi, May 07 2007

EXTENSIONS

a(15)-a(16) from Jinyuan Wang, Feb 05 2020

STATUS

approved

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Last modified May 27 10:54 EDT 2020. Contains 334655 sequences. (Running on oeis4.)