Numbers k such that k^2 contains only digits {0,2,5}, not ending with zero.

Terms

a(0) =5a(1) =15a(2) =45a(3) =235a(4) =505a(5) =745a(6) =1415a(7) =1485a(8) =4495a(9) =5005a(10) =15985a(11) =50005a(12) =72495a(13) =469255a(14) =500005a(15) =500505a(16) =1597505a(17) =1598515a(18) =4474955a(19) =5000005a(20) =5000505a(21) =5050005a(22) =7085235a(23) =15008515a(24) =44949995a(25) =50000005a(26) =50000505a(27) =50005005a(28) =50500005a(29) =500000005