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First differences of consecutive numbers having at least two identical neighboring digits in decimal representation.
3

%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