Least k such that (k*Mersenne-prime(n))^2 + 1 is prime.

Terms

a(0) =2a(1) =2a(2) =4a(3) =12a(4) =80a(5) =34a(6) =8a(7) =12a(8) =94a(9) =96a(10) =668a(11) =198a(12) =1170a(13) =38a(14) =700a(15) =2402a(16) =394a(17) =7154a(18) =4040a(19) =1740a(20) =4644a(21) =8976a(22) =12300