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First differences of A064572.
5

%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