Numbers having period-3 6-digitized sequences.

Terms

a(0) =9a(1) =13a(2) =31a(3) =37a(4) =39a(5) =49a(6) =57a(7) =73a(8) =75a(9) =79a(10) =88a(11) =90a(12) =93a(13) =94a(14) =97a(15) =103a(16) =115a(17) =117a(18) =130a(19) =134a(20) =143a(21) =149a(22) =151a(23) =171a(24) =194a(25) =223a(26) =232a(27) =301a(28) =307a(29) =309