If d,e are consecutive digits of n in base 10, then |d-e|>=5.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =16a(10) =17a(11) =18a(12) =19a(13) =27a(14) =28a(15) =29a(16) =38a(17) =39a(18) =49a(19) =50a(20) =60a(21) =61a(22) =70a(23) =71a(24) =72a(25) =80a(26) =81a(27) =82a(28) =83a(29) =90