A029540 - OEIS

%I #18 Mar 13 2020 20:48:13

%S 1,11,35,44,121,605,2156,8492,8844,9152,58300,134023,172051,181092,

%T 190124,200656,261063,287101,746493,779471,3080351,7868996,8724407

%N Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 23 (most significant digit on right).

%C This sequence differs from A061976 in that all least significant zeros are removed before concatenation.

%C No more terms < 10^7. [_Lars Blomberg_, Sep 29 2011]

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

%e See A029519 for example.

%t b = 23; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[IntegerReverse[#, b], b], c], b], #] &] (* _Robert Price_, Mar 13 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

%E Additional comments and more terms from Larry Reeves (larryr(AT)acm.org), May 25 2001

%E a(19)-a(23) from _Lars Blomberg_, Sep 29 2011