Every run of digits of n in base 6 has length 2.

Terms

a(0) =7a(1) =14a(2) =21a(3) =28a(4) =35a(5) =252a(6) =266a(7) =273a(8) =280a(9) =287a(10) =504a(11) =511a(12) =525a(13) =532a(14) =539a(15) =756a(16) =763a(17) =770a(18) =784a(19) =791a(20) =1008a(21) =1015a(22) =1022a(23) =1029a(24) =1043a(25) =1260a(26) =1267a(27) =1274a(28) =1281a(29) =1288