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

Terms

a(0) =1a(1) =2a(2) =2a(3) =6a(4) =2a(5) =14a(6) =2a(7) =90a(8) =18a(9) =80a(10) =230a(11) =80a(12) =354a(13) =84a(14) =84a(15) =1782a(16) =450a(17) =828a(18) =2562a(19) =2502a(20) =6882a(21) =9288a(22) =890a(23) =16022a(24) =11088a(25) =31034a(26) =7272a(27) =92372