Numbers k such that k^2 and k have same last 3 digits.

Terms

a(0) =0a(1) =1a(2) =376a(3) =625a(4) =1000a(5) =1001a(6) =1376a(7) =1625a(8) =2000a(9) =2001a(10) =2376a(11) =2625a(12) =3000a(13) =3001a(14) =3376a(15) =3625a(16) =4000a(17) =4001a(18) =4376a(19) =4625a(20) =5000a(21) =5001a(22) =5376a(23) =5625a(24) =6000a(25) =6001a(26) =6376a(27) =6625a(28) =7000a(29) =7001