Numbers k such that k^2 contains exactly 2 copies of each digit of k.

Terms

a(0) =72576a(1) =406512a(2) =415278a(3) =494462a(4) =603297a(5) =725760a(6) =3279015a(7) =4065120a(8) =4152780a(9) =4651328a(10) =4915278a(11) =4927203a(12) =4944620a(13) =4972826a(14) =4974032a(15) =4985523a(16) =4989323a(17) =5002245a(18) =5016125a(19) =6032970a(20) =6214358a(21) =6415002a(22) =6524235a(23) =7257600a(24) =9883667a(25) =32051745a(26) =32790150a(27) =35264171a(28) =37916946