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%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
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