Number of Proth primes: number of primes of the form 1 + k*2^n with k odd and k < 2^n.

Terms

a(0) =1a(1) =2a(2) =1a(3) =3a(4) =4a(5) =8a(6) =18a(7) =23a(8) =44a(9) =73a(10) =142a(11) =277a(12) =484a(13) =871a(14) =1644a(15) =3060a(16) =5851a(17) =10917a(18) =20776a(19) =39263a(20) =74752a(21) =142521a(22) =271223a(23) =520242a(24) =996486a(25) =1916486a(26) =3686628a(27) =7103236a(28) =13702428a(29) =26469008