%I #2 Mar 30 2012 17:38:10
%S 1,1,3,1,4,1,6,3,6,1,11,1,8,4,14,1,16,1,19,5,16,1,29,3,22,7,31,1,37,1,
%T 42,7,38,4,62,1,48,9,69,1,73,1,80,14,76,1,114,3,100,11,121,1,132,5,
%U 150,14,142,1,193,1,168,20,213,5,223,1,247,17,247,1,319,1,286,25,339,4,355
%N First differences of A064572.
%C Apparently a(n)=1 when n+1 is prime.
%Y A064572, A064573, A064574, A064576, A064577, A028422.
%K easy,nonn
%O 1,3
%A _Marc LeBrun_, Sep 20 2001