Numbers k such that 18*k+1 is a square.

Terms

a(0) =0a(1) =16a(2) =20a(3) =68a(4) =76a(5) =156a(6) =168a(7) =280a(8) =296a(9) =440a(10) =460a(11) =636a(12) =660a(13) =868a(14) =896a(15) =1136a(16) =1168a(17) =1440a(18) =1476a(19) =1780a(20) =1820a(21) =2156a(22) =2200a(23) =2568a(24) =2616a(25) =3016a(26) =3068a(27) =3500a(28) =3556a(29) =4020