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 A031297 a(n) = least k such that base 10 representation of n begins at s(k), where s=A007376. 5

%I

%S 1,2,3,4,5,6,7,8,9,10,12,1,16,18,20,22,24,26,28,30,15,34,2,38,40,42,

%T 44,46,48,50,17,37,56,3,60,62,64,66,68,70,19,39,59,78,4,82,84,86,88,

%U 90,21,41,61,81,100,5,104,106,108,110,23,43,63,83

%N a(n) = least k such that base 10 representation of n begins at s(k), where s=A007376.

%C A229186 is the same sequence including the a(0) term.

%H Nathaniel Johnston, <a href="/A031297/b031297.txt">Table of n, a(n) for n = 1..10000</a>

%p with(StringTools): s:="": for n from 1 to 70 do s:=cat(s,convert(n,string)): od: seq(Search(convert(n, string), s), n=1..70); # _Nathaniel Johnston_, May 26 2011

%Y Cf. A229186 (same sequence but including the a(0) term).

%Y Cf. A165449.

%K nonn,easy,base

%O 1,2

%A _Clark Kimberling_

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Last modified May 25 02:01 EDT 2020. Contains 334581 sequences. (Running on oeis4.)