Numbers having period-2 3-digitized sequences.

Terms

a(0) =49a(1) =94a(2) =136a(3) =163a(4) =199a(5) =244a(6) =316a(7) =337a(8) =361a(9) =373a(10) =379a(11) =397a(12) =409a(13) =424a(14) =442a(15) =478a(16) =487a(17) =490a(18) =613a(19) =631a(20) =733a(21) =739a(22) =748a(23) =784a(24) =793a(25) =847a(26) =874a(27) =904a(28) =919a(29) =937