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%I #7 May 25 2015 14:58:07
%S 27,127,227,279,327,427,527,627,727,827,927,1027,1127,1227,1279,1327,
%T 1427,1527,1627,1727,1827,1927,2027,2127,2227,2279,2327,2427,2527,
%U 2627,2799,2827,2927,3027,3127,3227,3279,3327,3427
%N Numbers n such that string 2,7 occurs in the base 10 representation of n but not of n+1.
%t Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n],{2,7}]>0,1,0],{n,4000}],{1,0}]][[1]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* _Harvey P. Dale_, May 25 2015 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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