Numbers k such that 2^(k-1)*(2^k - 1) + 1 is prime (see A134169).

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =9a(5) =10a(6) =13a(7) =19a(8) =45a(9) =46a(10) =58a(11) =141a(12) =271a(13) =336a(14) =562a(15) =601a(16) =1128a(17) =1635a(18) =2718a(19) =2920a(20) =3933a(21) =4351a(22) =4729a(23) =6556a(24) =8349a(25) =10851a(26) =32641a(27) =34039a(28) =41050a(29) =63732