Numbers k such that k^2 is the concatenation of two numbers m and 8*m.

Terms

a(0) =18a(1) =36a(2) =168a(3) =252a(4) =336a(5) =1668a(6) =3336a(7) =16668a(8) =33336a(9) =166668a(10) =333336a(11) =1666668a(12) =3333336a(13) =16666668a(14) =22222224a(15) =27777780a(16) =33333336a(17) =113149848a(18) =114678900a(19) =116207952a(20) =117737004a(21) =119266056a(22) =120795108a(23) =122324160a(24) =123853212