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%I #30 Jan 13 2025 13:25:25
%S 1,3,9,21,27,48,144,352,361,4672,5904,7392,15323,25488,32096,55491,
%T 71712,89259,101437,139776,752011,2215168,5082544,6766761
%N Numbers k such that k divides the (left) concatenation of all numbers <= k written in base 25 (most significant digit on right and removing all least significant zeros before concatenation).
%C This sequence differs from A061978 in that all least significant zeros are removed before concatenation.
%C No more terms < 10^7. - _Lars Blomberg_, Oct 01 2011
%H <a href="/index/N#concat">Index entries for related sequences</a>
%e See A029519 for example.
%t b = 25; 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,changed
%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), Jun 04 2001
%E a(21)-a(24) from _Lars Blomberg_, Oct 01 2011