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%I #14 Feb 25 2014 06:22:48
%S 2,2,8,2,12,2,2,98,38,122,126,678,440,1040,776,1398,2714,3362,650,
%T 8910,22010,11172,1422,5274,33944,4508,12614,202298,275466
%N Smallest k such that k*Mersenne_prime(n)^2 -1 (or k*A000668(n)^2 -1) is prime.
%e 2*((2^2-1)^2)-1=17 prime so a(1)=2.
%Y Cf. A000668
%K more,nonn
%O 1,1
%A _Pierre CAMI_, Oct 08 2004
%E a(19)-a(22) from _Donovan Johnson_, Mar 23 2008
%E a(23)-a(29) from _Pierre CAMI_, Feb 15 2014