Least prime of the form 1 + p*2^n, where p is an odd prime.

Terms

a(0) =7a(1) =13a(2) =41a(3) =113a(4) =97a(5) =193a(6) =641a(7) =769a(8) =11777a(9) =13313a(10) =59393a(11) =12289a(12) =40961a(13) =114689a(14) =163841a(15) =2424833a(16) =6946817a(17) =786433a(18) =5767169a(19) =7340033a(20) =23068673a(21) =155189249a(22) =595591169a(23) =1224736769a(24) =167772161a(25) =469762049a(26) =2281701377a(27) =3489660929a(28) =12348030977