%I #5 Jul 24 2023 10:23:32
%S 3,53,11,17,317,89,1259,2543,7517,16217,15107,33119,60611,671063,
%T 2648057
%N Least prime 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 A000043(i).
%Y Cf. A000043, A139426, A143385, A143386.
%K hard,more,nonn
%O 1,1
%A _Pierre CAMI_, Aug 11 2008