Least number k such that (k*M(n))^2 + k*M(n) - 1 is prime with M(i)=i-th Mersenne prime.

Terms

a(0) =1a(1) =3a(2) =1a(3) =7a(4) =8a(5) =19a(6) =13a(7) =4a(8) =16a(9) =3a(10) =42a(11) =24a(12) =434a(13) =84a(14) =160a(15) =579a(16) =475a(17) =529a(18) =2450a(19) =2644a(20) =3928a(21) =558a(22) =13680a(23) =7146a(24) =1408a(25) =3003a(26) =2369a(27) =55000a(28) =83873