Smallest odd prime p such that n = (p - 1) / ord_p(2).

Terms

a(0) =3a(1) =7a(2) =43a(3) =113a(4) =251a(5) =31a(6) =1163a(7) =73a(8) =397a(9) =151a(10) =331a(11) =1753a(12) =4421a(13) =631a(14) =3061a(15) =257a(16) =1429a(17) =127a(18) =6043a(19) =3121a(20) =29611a(21) =1321a(22) =18539a(23) =601a(24) =15451a(25) =14327a(26) =2971a(27) =2857a(28) =72269a(29) =3391