Number of primes of the form k*2^n + 1 with k < 2^n.

Terms

a(0) =1a(1) =2a(2) =2a(3) =5a(4) =10a(5) =16a(6) =31a(7) =47a(8) =88a(9) =149a(10) =290a(11) =536a(12) =952a(13) =1769a(14) =3280a(15) =6186a(16) =11638a(17) =21901a(18) =41488a(19) =78543a(20) =149662a(21) =284735a(22) =543155a(23) =1040577a(24) =1994339a(25) =3834731a(26) =7373228a(27) =14206331a(28) =27405523a(29) =52941914