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A044170 Numbers n such that string 4,4 occurs in the base 7 representation of n but not of n-1. 0

%I

%S 32,81,130,179,224,277,326,375,424,473,522,567,620,669,718,767,816,

%T 865,910,963,1012,1061,1110,1159,1208,1253,1306,1355,1404,1453,1502,

%U 1551,1568,1649,1698,1747,1796,1845,1894,1939,1992

%N Numbers n such that string 4,4 occurs in the base 7 representation of n but not of n-1.

%t Select[Range[2000],MemberQ[Partition[IntegerDigits[#,7],2,1],{4,4}] && !MemberQ[Partition[IntegerDigits[#-1,7],2,1],{4,4}]&] (* _Harvey P. Dale_, Jan 17 2014 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified May 21 17:51 EDT 2022. Contains 353921 sequences. (Running on oeis4.)