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A044288 Numbers n such that string 4,1 occurs in the base 9 representation of n but not of n-1. 0

%I #8 Nov 21 2013 12:47:03

%S 37,118,199,280,333,361,442,523,604,685,766,847,928,1009,1062,1090,

%T 1171,1252,1333,1414,1495,1576,1657,1738,1791,1819,1900,1981,2062,

%U 2143,2224,2305,2386,2467,2520,2548,2629,2710,2791

%N Numbers n such that string 4,1 occurs in the base 9 representation of n but not of n-1.

%t Select[Range[3000],MemberQ[Partition[IntegerDigits[#,9],2,1],{4,1}] && !MemberQ[Partition[IntegerDigits[#-1,9],2,1],{4,1}]&] (* _Harvey P. Dale_, Sep 21 2011 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_

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Last modified February 23 08:04 EST 2024. Contains 370269 sequences. (Running on oeis4.)