Numbers k such that 2*F(k) + 1 is a prime, where F = A000045.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =8a(7) =11a(8) =13a(9) =19a(10) =21a(11) =22a(12) =24a(13) =27a(14) =40a(15) =44a(16) =51a(17) =62a(18) =92a(19) =139a(20) =208a(21) =224a(22) =293a(23) =307a(24) =421a(25) =509a(26) =741a(27) =861a(28) =966a(29) =989