

A290116


Primes of the form k! / 2  1.


1




OFFSET

1,1


LINKS

Robert Price, Table of n, a(n) for n = 1..7
Joe McLean, Interesting Sources of Probable Primes
OpenPFGW Project, Primality Tester


FORMULA

a = (A082671(n)!2)/2.


EXAMPLE

6! / 2  1 = 359, which is prime, so 359 is in the sequence.
7! / 2  1 = 2519 = 11 * 229, so 2519 is not in the sequence.


MATHEMATICA

Select[Table[k! / 2  1, {k, 2, 100}], PrimeQ[#]&]


CROSSREFS

Cf. A082671, A139172.
Sequence in context: A280674 A139172 A228868 * A251180 A286194 A164034
Adjacent sequences: A290113 A290114 A290115 * A290117 A290118 A290119


KEYWORD

nonn


AUTHOR

Robert Price, Jul 19 2017


STATUS

approved



