Numbers whose consecutive digits differ by 4.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =15a(11) =26a(12) =37a(13) =40a(14) =48a(15) =51a(16) =59a(17) =62a(18) =73a(19) =84a(20) =95a(21) =151a(22) =159a(23) =262a(24) =373a(25) =404a(26) =484a(27) =515a(28) =595a(29) =626