Numbers having period-4 6-digitized sequences.

Terms

a(0) =255a(1) =466a(2) =525a(3) =552a(4) =646a(5) =664a(6) =2055a(7) =2505a(8) =2550a(9) =3689a(10) =3698a(11) =3869a(12) =3896a(13) =3968a(14) =3986a(15) =4066a(16) =4606a(17) =4660a(18) =4789a(19) =4798a(20) =4879a(21) =4897a(22) =4978a(23) =4987a(24) =5025a(25) =5052a(26) =5205a(27) =5250a(28) =5502a(29) =5520