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%I #15 Mar 08 2020 20:54:00
%S 1,3,5,7,15,25,80,321,401,1105,1440,2185,17665,26585,132920,287216,
%T 659355,1267785,2096240,3612505
%N Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 21 (most significant digit on right).
%C This sequence differs from A029514 in that all least significant zeros are removed before concatenation.
%C No more terms < 10^7. [_Lars Blomberg_, Oct 24 2011]
%H <a href="/index/N#concat">Index entries for related sequences</a>
%e See A061931 for example.
%t b = 21; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[c, IntegerDigits[IntegerReverse[#, b], b]], b], #] &] (* _Robert Price_, Mar 08 2020 *)
%Y Cf. A029447-A029470, A029471-A029494, A029495-A029518, A029519-A029542, A061931-A061954, A061955-A061978.
%K nonn,base,more
%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(17)-a(20) from _Lars Blomberg_, Oct 24 2011
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