Numbers n such that 197*2^n-1 is prime.

Terms

a(0) =2a(1) =16a(2) =20a(3) =22a(4) =40a(5) =82a(6) =112a(7) =178a(8) =230a(9) =302a(10) =304a(11) =328a(12) =374a(13) =442a(14) =472a(15) =500a(16) =580a(17) =694a(18) =1264a(19) =1634a(20) =1784a(21) =3080a(22) =5722a(23) =7174a(24) =8908a(25) =18502a(26) =18746a(27) =39094a(28) =99338a(29) =170066