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%I #5 Mar 30 2012 18:56:43
%S 19,100,171,181,262,343,424,505,586,667,748,829,900,910,991,1072,1153,
%T 1234,1315,1396,1477,1539,1629,1639,1720,1801,1882,1963,2044,2125,
%U 2206,2287,2358,2368,2449,2530,2611,2692,2773,2854
%N Numbers n such that string 2,1 occurs in the base 9 representation of n but not of n-1.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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