Smallest index i such that next_prime( 2*prime(i) ) - 2*prime(i) = 2n - 1.

Terms

a(0) =1a(1) =4a(2) =11a(3) =20a(4) =17a(5) =67a(6) =104a(7) =56a(8) =125a(9) =165a(10) =182a(11) =316a(12) =236a(13) =359a(14) =407a(15) =1254a(16) =667a(17) =836a(18) =1521a(19) =1210a(20) =1966a(21) =3197a(22) =1520a(23) =2294a(24) =2279a(25) =2046a(26) =5410a(27) =5472a(28) =1965a(29) =6702