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%I #7 Mar 03 2019 12:25:51
%S 36,85,134,183,232,252,281,330,379,428,477,526,575,595,624,673,722,
%T 771,820,869,918,938,967,1016,1065,1114,1163,1212,1261,1281,1310,1359,
%U 1408,1457,1506,1555,1604,1624,1653,1702,1751,1764
%N Numbers n such that string 5,1 occurs in the base 7 representation of n but not of n-1.
%t SequencePosition[Table[If[SequenceCount[IntegerDigits[n,7],{5,1}]>0,1,0],{n,2000}],{0,1}][[All,2]] (* _Harvey P. Dale_, Mar 03 2019 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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