Least prime of the form n*2^m+1 for m>0, or 0 if there is no such prime.

Terms

a(0) =3a(1) =5a(2) =7a(3) =17a(4) =11a(5) =13a(6) =29a(7) =17a(8) =19a(9) =41a(10) =23a(11) =97a(12) =53a(13) =29a(14) =31a(15) =257a(16) =137a(17) =37a(18) =1217a(19) =41a(20) =43a(21) =89a(22) =47a(23) =97a(24) =101a(25) =53a(26) =109a(27) =113a(28) =59a(29) =61