Numbers k such that 231*2^k-1 is prime.

Terms

a(0) =1a(1) =3a(2) =6a(3) =7a(4) =21a(5) =29a(6) =46a(7) =49a(8) =54a(9) =57a(10) =73a(11) =90a(12) =118a(13) =169a(14) =207a(15) =267a(16) =287a(17) =333a(18) =354a(19) =366a(20) =370a(21) =463a(22) =493a(23) =497a(24) =507a(25) =655a(26) =729a(27) =735a(28) =757a(29) =1054