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A061960 Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 7 (most significant digit on right). 1

%I #14 Mar 08 2020 00:25:29

%S 1,3,12,171,324,717,867,977,2040,6017,13921,54036,81097,88580,265515,

%T 306612,349707,1075152,1189787,2579041

%N Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 7 (most significant digit on right).

%C This sequence differs from A029524 in that all least significant zeros are kept during concatenation.

%C No more terms < 10^7.

%H <a href="/index/N#concat">Index entries for related sequences</a>

%e See A061955 for example.

%t b = 7; c = {}; Select[Range[10^4], Divisible[FromDigits[

%t c = Join[Reverse[IntegerDigits[#, b]], c], b], #] &] (* _Robert Price_, Mar 07 2020 *)

%Y Cf. A029447-A029470, A029471-A029494, A029495-A029518, A029519-A029542, A061931-A061954, A061955-A061978.

%K nonn,base

%O 1,2

%A Larry Reeves (larryr(AT)acm.org), May 24 2001

%E Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002

%E a(18)-a(20) from _Lars Blomberg_, Aug 23 2011

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)