Numbers whose base-4 expansion has no run of digits with length < 2.

Terms

a(0) =5a(1) =10a(2) =15a(3) =21a(4) =42a(5) =63a(6) =80a(7) =85a(8) =90a(9) =95a(10) =160a(11) =165a(12) =170a(13) =175a(14) =240a(15) =245a(16) =250a(17) =255a(18) =320a(19) =336a(20) =341a(21) =346a(22) =351a(23) =362a(24) =383a(25) =640a(26) =661a(27) =672a(28) =677a(29) =682