A029504 - OEIS

A029504

Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 11 (most significant digit on right).

%I #18 Mar 12 2020 22:22:27

%S 1,5,15,24,40,69,72,75,120,167,216,280,360,536,1192,1240,1360,11280,

%T 25195,33216,33984,101328,221640,400479,531000,537640,600104,631155,

%U 743085,958785,2660431,2777800

%N Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 11 (most significant digit on right).

%C This sequence differs from A061940 in that all least significant zeros are kept during concatenation.

%C No more terms < 10^7. - _Lars Blomberg_, Oct 06 2011

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

%e See A029495 for example.

%t b = 11; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[c, Reverse[IntegerDigits[#, b]]], b], #] &] (* _Robert Price_, Mar 12 2020 *)

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

%K nonn,base,more

%O 1,2

%A _Olivier Gérard_

%E Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002; Aug 25, 2002

%E a(27)-a(32) from _Lars Blomberg_, Oct 06 2011