n does not have the property that all even digits occur together and all odd digits occur together.

Terms

a(0) =101a(1) =103a(2) =105a(3) =107a(4) =109a(5) =121a(6) =123a(7) =125a(8) =127a(9) =129a(10) =141a(11) =143a(12) =145a(13) =147a(14) =149a(15) =161a(16) =163a(17) =165a(18) =167a(19) =169a(20) =181a(21) =183a(22) =185a(23) =187a(24) =189a(25) =210a(26) =212a(27) =214a(28) =216a(29) =218