Numbers k such that 267*2^k-1 is prime.

Terms

a(0) =4a(1) =5a(2) =8a(3) =14a(4) =16a(5) =17a(6) =20a(7) =26a(8) =28a(9) =34a(10) =40a(11) =44a(12) =53a(13) =58a(14) =74a(15) =80a(16) =86a(17) =94a(18) =128a(19) =130a(20) =140a(21) =149a(22) =178a(23) =365a(24) =448a(25) =878a(26) =920a(27) =1217a(28) =2417a(29) =3400