Smallest prime of form (2n+1)*2^m-1 for some m, or 0 if no such prime exists.

Terms

a(0) =3a(1) =2a(2) =19a(3) =13a(4) =17a(5) =43a(6) =103a(7) =29a(8) =67a(9) =37a(10) =41a(11) =367a(12) =199a(13) =53a(14) =463a(15) =61a(16) =131a(17) =139a(18) =73a(19) =311a(20) =163a(21) =5503a(22) =89a(23) =751a(24) =97a(25) =101a(26) =211a(27) =109a(28) =113a(29) =241663