Every run of digits of n in base 3 has length 2.

Terms

a(0) =4a(1) =8a(2) =36a(3) =44a(4) =72a(5) =76a(6) =328a(7) =332a(8) =396a(9) =400a(10) =652a(11) =656a(12) =684a(13) =692a(14) =2952a(15) =2960a(16) =2988a(17) =2992a(18) =3568a(19) =3572a(20) =3600a(21) =3608a(22) =5868a(23) =5876a(24) =5904a(25) =5908a(26) =6160a(27) =6164a(28) =6228a(29) =6232