%I
%S 0,10,12,23,34,45,56,67,78,89,109,110,112,1213,1314,1415,1516,1617,
%T 1718,1819,1920,2021,221,223,2324,2425,2526,2627,2728,2829,2930,3031,
%U 3132,332,334,3435,3536
%N Both character strings a(n) and a(n+1) share the substring "n".
%e If n = 10 then a(n) = 109 and a(n+1) = 110; "109" and "110" both show the substring "10" which is "n".
%K base,easy,nonn
%O 0,2
%A _Eric Angelini_, Oct 04 2004
