Positive numbers y such that y^2 is of the form x^2+(x+409)^2 with integer x.

Terms

a(0) =305a(1) =409a(2) =641a(3) =1189a(4) =2045a(5) =3541a(6) =6829a(7) =11861a(8) =20605a(9) =39785a(10) =69121a(11) =120089a(12) =231881a(13) =402865a(14) =699929a(15) =1351501a(16) =2348069a(17) =4079485a(18) =7877125a(19) =13685549a(20) =23776981a(21) =45911249a(22) =79765225a(23) =138582401a(24) =267590369a(25) =464905801a(26) =807717425a(27) =1559630965