

A099351


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


10



3, 5, 8, 13, 20, 25, 51, 97, 101, 241, 266, 521, 1279, 1750
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OFFSET

1,1


COMMENTS

a(15) > 1879.  Jinyuan Wang, Feb 04 2020


LINKS

Table of n, a(n) for n=1..14.
Index entries for sequences related to numbers of primes of the form k*n!+1


EXAMPLE

k = 5 is here because 5*5!  1 = 599 is prime.


MAPLE

for n from 0 to 1000 do if isprime(5*n!  1) then print(n) end if end do;


MATHEMATICA

Select[Range[550], PrimeQ[5#!1]&] (* Harvey P. Dale, Nov 27 2013 *)


PROG

(PARI) is(n)=ispseudoprime(5*n!1) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Cf. A002982, A076133, A076134, A099350, A180627, A180628, A180629, A180630, A180631.
Sequence in context: A035421 A035424 A245934 * A265065 A265066 A265067
Adjacent sequences: A099348 A099349 A099350 * A099352 A099353 A099354


KEYWORD

nonn,more


AUTHOR

Brian Kell, Oct 12 2004


EXTENSIONS

a(13)a(14) from Jinyuan Wang, Feb 04 2020


STATUS

approved



