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%I #5 Jul 24 2023 10:24:19
%S 1,53,11,17,317,89,737,2543,1247,6209,15107,33119,60611,671063,2648057
%N Least a(n) such that M(n)*(M(n)+a(n))-1 and M(n)*(M(n)+a(n))+1 are twin primes with M(i)=i-th Mersenne prime.
%e (2^2-1)*(2^2-1+1)-1=11 prime, 11 and 13 twin primes, 2^2-1=M(1) so a(1)=1
%Y Cf. A139426.
%K hard,more,nonn
%O 1,2
%A _Pierre CAMI_, Aug 11 2008
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