A048409 - OEIS

%I #5 Oct 10 2019 23:17:49

%S 0,1,2,3,4,5,6,7,8,9,18,29,70,81,92,181,292,707,818,929,1818,2929,

%T 7070,8181,9292,18181,29292,70707,81818,92929,181818,292929,707070,

%U 818181,929292,1818181,2929292,7070707,8181818,9292929,18181818,29292929

%N Numbers whose consecutive digits differ by 7.

%Y Cf. A033075, A033088, A033081, A048407-A048410.

%K nonn,base

%O 0,3

%A _Patrick De Geest_, Apr 15 1999