%I
%S 99,110,110,110,110,110,110,110,110,100,11,88,99,99,99,99,99,99,99,99,
%T 112,11,77,88,88,88,88,88,88,88,88,112,11,66,77,77,77,77,77,77,77,77,
%U 112,11,55,66,66,66,66,66,66,66,66,112,11,44,55,55,55,55,55,55,55,55
%N Smallest number m such that m and m+n have both at least two identical neighboring digits in their decimal representations.
%C a(n) + n = A171901(k) for some k.
%H R. Zumkeller, <a href="/A171904/b171904.txt">Table of n, a(n) for n = 1..10000</a>
%F A196368(a(n)) + A196368(a(n)+n) = 0.  _Reinhard Zumkeller_, Jan 31 2014
%o (Haskell)
%o a171904 n = head [m  m < a171901_list, a196368 (m + n) == 0]
%o  _Reinhard Zumkeller_, Jan 31 2014
%Y Cf. A196368, A171901, A171903.
%K base,nonn,look
%O 1,1
%A _Reinhard Zumkeller_, Feb 07 2010
