A064576 - OEIS

%I #2 Mar 30 2012 17:38:10

%S 1,1,2,1,3,1,4,2,5,1,8,1,7,3,10,1,13,1,15,4,15,1,23,2,21,5,27,1,33,1,

%T 36,6,37,3,53,1,47,8,62,1,68,1,75,11,75,1,103,2,97,10,115,1,126,4,142,

%U 13,141,1,181,1,167,17,202,4,218,1,239,16,243,1,302,1,285,22,331,3,349

%N First differences of A064573.

%C Apparently a(n)=1 when n+1 is prime.

%Y A064572, A064573, A064574, A064575, A064577, A028422.

%K easy,nonn

%O 1,3

%A _Marc LeBrun_, Sep 20 2001