Numbers which are the difference of two positive squares, c^2 - b^2 with 1 <= b < c.

Terms

a(0) =3a(1) =5a(2) =7a(3) =8a(4) =9a(5) =11a(6) =12a(7) =13a(8) =15a(9) =16a(10) =17a(11) =19a(12) =20a(13) =21a(14) =23a(15) =24a(16) =25a(17) =27a(18) =28a(19) =29a(20) =31a(21) =32a(22) =33a(23) =35a(24) =36a(25) =37a(26) =39a(27) =40a(28) =41a(29) =43