Numbers n such that the decimal number concat(6,n) is a square.

Terms

a(0) =4a(1) =25a(2) =76a(3) =241a(4) =400a(5) =561a(6) =724a(7) =889a(8) =1009a(9) =1504a(10) =2001a(11) =2500a(12) =3001a(13) =3504a(14) =4009a(15) =4516a(16) =5025a(17) =5536a(18) =6049a(19) =6564a(20) =7081a(21) =7600a(22) =8121a(23) =8644a(24) =9169a(25) =9696a(26) =11524a(27) =13089a(28) =14656a(29) =16225