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%I #2 Mar 30 2012 17:31:29
%S 12,13,15,17,25,47,117,409,1985,13269,116555,1301043,17911307,
%T 296651169,5792367991,131137897895,3395020992813,99343099511585
%N a(1) = 12, a(n) = prime(a(n-1)) - 2a(n-1).
%t NestList[ Prime@# - 2# &, 12, 17]
%Y Cf. A007097, A074271, A179274, A179511, A179513, A179514, A179515, A179516, A179517, A179518.
%K nonn
%O 1,1
%A _Robert G. Wilson v_, Jul 17 2010
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