login
a(n)=least s>0 such that n!!-s is prime.
0

%I #4 Mar 30 2012 17:26:04

%S 1,1,2,1,2,1,4,7,4,7,4,23,2,1,2,97,2,19,64,17,62,19,4,1,58,23,64,157,

%T 122,47,106,47,4,29,146,31,64,29,8,71,8,43,32,31,128,67,122,41,2,37,

%U 146,137,122,191,142,59,128,71,284,109,274,1,218,97,32,83,158,53,166

%N a(n)=least s>0 such that n!!-s is prime.

%C Unlike the case n!!+s in A057019, there is no apparent rule for s here.

%Y Cf. A057019.

%K nonn

%O 3,3

%A _Zak Seidov_, Nov 02 2002