%I #6 Sep 14 2013 13:41:23
%S 11,11,11,11,11,11,11,11,1,10,1,1,1,1,1,1,1,1,1,3,11,11,11,11,11,11,
%T 11,1,11,9,1,1,1,1,1,1,1,1,1,4,11,11,11,11,11,11,1,11,11,8,1,1,1,1,1,
%U 1,1,1,1,5,11,11,11,11,11,1,11,11,11,7,1,1,1,1,1,1,1,1,1,6,11,11,11,11,1,11
%N First differences of consecutive numbers having at least two identical neighboring digits in decimal representation.
%C a(n) = A171901(n+1) - A171901(n);
%C 1 <= a(n) <= 11;
%C a(A171903(n)) = 1.
%H R. Zumkeller, <a href="/A171902/b171902.txt">Table of n, a(n) for n = 1..10000</a>
%K nonn,base
%O 1,1
%A _Reinhard Zumkeller_, Feb 07 2010