A181185 - OEIS

A181185

Numbers k such that (2^k - 1) * k! + 1 is prime.

1, 2, 3, 6, 17, 25, 40, 45, 143, 289, 510, 524, 526, 716, 756, 1008, 1271, 1370, 3677, 7963, 9053

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OFFSET

1,2

COMMENTS

The original motivation for this sequence was in an article by J. Earls, Horace S. Uhler and Some Numbers in His Honor, the author of which no longer wishes to make public. - N. J. A. Sloane, Apr 04 2016

LINKS

Table of n, a(n) for n=1..21.

PROG

(PARI) is(n)=ispesudoprime((2^n-1)*n!+1) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A003323 A230146 A102980 * A241945 A018284 A204514

Adjacent sequences: A181182 A181183 A181184 * A181186 A181187 A181188

KEYWORD

more,nonn

AUTHOR

Jason Earls, Oct 09 2010

EXTENSIONS

a(20)-a(21) from Tyler Busby, Mar 10 2024

STATUS

approved