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%I #4 Mar 31 2012 13:22:05
%S 1,1,7,135,549,7209,1741,4197,172434,2638147
%N Sequence of a(n) such that : define p(0)=2 the first prime, then p(n+1)=least prime p of the form a(n)*p(n)*(a(n)*p(n)+1)-1 with a twin prime p+2.
%e 1*2*(1*2+1)-1=5, 7 twin prime so a(1)=1
%e 1*5*(1*5+1)-1=29, 31 twin prime so a(2)=1
%Y Cf. A120393.
%K more,nonn
%O 1,3
%A _Pierre CAMI_, Jul 28 2008
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