If d,e are consecutive digits of n in base 11, then |d-e|>=4.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =10a(10) =16a(11) =17a(12) =18a(13) =19a(14) =20a(15) =21a(16) =28a(17) =29a(18) =30a(19) =31a(20) =32a(21) =40a(22) =41a(23) =42a(24) =43a(25) =44a(26) =52a(27) =53a(28) =54a(29) =55