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A088947 Positions of records in A069862. 2

%I

%S 1,2,5,7,10,13,25,27,31,37,151,277,385,451,902,6314,6601,16627,24673,

%T 30371,31451,32338,36058,41173,44083,44215,47322,52580

%N Positions of records in A069862.

%C A069862 is the smallest k such that n divides the concatenation of numbers from (n+1) to (n+k), where (n+1) is on the most significant side.

%H C. Seggelin, <a href="http://www.plastereddragon.com/maths/catcon.htm">Concatenation of Consecutive Integers</a>.

%e f(31) = 110 which exceeds f(27) = 26; f(451) = 100270; f(902) = 999100.

%t f[n_] := Block[{k = n + 1}, d = k; While[ d != 0, k++; d = Mod[d*10^Floor[ Log[10, k] + 1] + k, n]]; k - n]; a = 0; Do[b = f[n]; If[b > a, a = b; Print[n, " = ", b]], {n, 1, 34500}]

%Y Cf. A069862, A088343 (for records themselves).

%K nonn,base

%O 1,2

%A _Robert G. Wilson v_, Oct 29 2003

%E More terms from _Robert G. Wilson v_ and Chuck Seggelin (chuck(AT)plastereddragon.com), Nov 14 2003

%E Edited by _Charles R Greathouse IV_, Apr 24 2010

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Last modified August 22 21:43 EDT 2019. Contains 326209 sequences. (Running on oeis4.)