Numbers n such that 3*2^(n-1) - 1 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =8a(7) =12a(8) =19a(9) =35a(10) =39a(11) =44a(12) =56a(13) =65a(14) =77a(15) =95a(16) =104a(17) =144a(18) =207a(19) =217a(20) =307a(21) =325a(22) =392a(23) =459a(24) =471a(25) =828a(26) =1275a(27) =3277a(28) =4205a(29) =5135