Numbers of the form (k^2 - 2) / 2 where k - 1 and k + 1 are both odd composite numbers.

Terms

a(0) =337a(1) =577a(2) =1249a(3) =1567a(4) =2047a(5) =2887a(6) =3697a(7) =4231a(8) =4417a(9) =6727a(10) =6961a(11) =7199a(12) =7441a(13) =7687a(14) =8977a(15) =10081a(16) =10367a(17) =10657a(18) =11857a(19) =12799a(20) =14449a(21) =15487a(22) =16927a(23) =17297a(24) =17671a(25) =20401a(26) =20807a(27) =21217a(28) =21631a(29) =22897