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A029513 Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 20 (most significant digit on right). 1

%I #18 Mar 13 2020 10:40:26

%S 1,2,4,5,6,10,12,14,18,19,53,703,1824,2185,2546,5054,6594,9841,

%T 1393056,1648110,1984492,2648114,3430811,8070122

%N Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 20 (most significant digit on right).

%C This sequence differs from A061949 in that all least significant zeros are kept during concatenation.

%C No more terms < 10^7. [_Lars Blomberg_, Oct 14 2011]

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

%e See A029495 for example.

%t b = 20; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[c, Reverse[IntegerDigits[#, b]]], 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 GĂ©rard_

%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(24) from _Lars Blomberg_, Oct 14 2011

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Last modified March 28 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)