Numbers k such that the decimal number 1k is a square.

Terms

a(0) =6a(1) =21a(2) =44a(3) =69a(4) =96a(5) =156a(6) =225a(7) =296a(8) =369a(9) =444a(10) =521a(11) =600a(12) =681a(13) =764a(14) =849a(15) =936a(16) =1025a(17) =1236a(18) =1449a(19) =1664a(20) =1881a(21) =2100a(22) =2321a(23) =2544a(24) =2769a(25) =2996a(26) =3225a(27) =3456a(28) =3689a(29) =3924