Positive numbers y such that y^2 is of the form x^2+(x+521)^2 with integer x.

Terms

a(0) =445a(1) =521a(2) =629a(3) =2041a(4) =2605a(5) =3329a(6) =11801a(7) =15109a(8) =19345a(9) =68765a(10) =88049a(11) =112741a(12) =400789a(13) =513185a(14) =657101a(15) =2335969a(16) =2991061a(17) =3829865a(18) =13615025a(19) =17433181a(20) =22322089a(21) =79354181a(22) =101608025a(23) =130102669a(24) =462510061a(25) =592214969a(26) =758293925a(27) =2695706185a(28) =3451681789a(29) =4419660881