Number of Proth primes < 2^n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =7a(7) =9a(8) =12a(9) =17a(10) =21a(11) =27a(12) =33a(13) =50a(14) =62a(15) =84a(16) =110a(17) =148a(18) =182a(19) =253a(20) =327a(21) =467a(22) =610a(23) =855a(24) =1097a(25) =1548a(26) =1999a(27) =2849a(28) =3648a(29) =5231