A076194 Numbers k such that k!! + 2^7 is prime.

3, 7, 17, 19, 31, 43, 51, 163, 215, 269, 297, 457, 599, 633, 795, 999, 1027, 1261, 2567, 14315, 39505, 44725

Offset

1,1

Comments

a(23) > 50000. - Robert Price, Mar 09 2015

Links

Table of n, a(n) for n=1..22.

The OpenPFGW Project, Primality Tester

Crossrefs

Cf. A006882, A080778 and A076185, A076186, A076188, A076189, A076190, A076193, A076195, A076196, A076197 for other values of s in n!! + 2^s.

Sequence in context: A306355 A087749 A140863 * A167168 A064699 A113304

Adjacent sequences: A076191 A076192 A076193 * A076195 A076196 A076197

Keyword

nonn,more

Author

Zak Seidov, Nov 02 2002

Extensions

Edited and extended (n < 4096) by Hugo Pfoertner, Jun 19 2003

a(20) from Robert Price, Feb 04 2013

a(21)-a(22) from Robert Price, Mar 09 2015

Status

approved