Numbers having period-3 3-digitized sequences.

Terms

a(0) =4a(1) =13a(2) =16a(3) =22a(4) =25a(5) =28a(6) =31a(7) =40a(8) =46a(9) =52a(10) =55a(11) =61a(12) =64a(13) =79a(14) =82a(15) =97a(16) =103a(17) =106a(18) =115a(19) =127a(20) =130a(21) =133a(22) =151a(23) =160a(24) =172a(25) =202a(26) =205a(27) =208a(28) =217a(29) =220