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%I A174215 #6 Mar 30 2012 18:52:53
%S A174215 2,1,1,1,1,6,2,1,1,1,1,1,1,1,1,1,1,1,13,1,1,1,5,2,2,1,1,1,1,1,1,1,1,1,
%T A174215 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,31,1,1,1,1,1,1,1,1,1,1,1,1,1,
%U A174215 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
%N A174215 First differences of A174214.
%C A174215 If a(n) is odd, then it is 1 or prime; if a(n) is even, then 2+a(n)/2 is prime.
%H A174215 V. Shevelev, <a href="http://arXiv.org/abs/0912.4006">Theorems on twin primes-dual case</a>, arXiv:0912.4006
%F A174215 a(n) = A174214(n+1)-A174214(n).
%Y A174215 Cf. A167495, A166945, A174214
%K A174215 nonn,easy
%O A174215 9,1
%A A174215 _Vladimir Shevelev_, Mar 12 2010
%E A174215 Terms corrected, using the Mathar-Layman corrections of A174214, by _Vladimir Shevelev_, Mar 26 2010

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