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Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 18 (most significant digit on right).
1

%I #14 Mar 09 2020 22:00:01

%S 1,17,89,6343,9707,9799,91069,120581,484307,725341,2571749,3432583,

%T 4482203

%N Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 18 (most significant digit on right).

%C This sequence differs from A029535 in that all least significant zeros are kept during concatenation.

%C No more terms < 8*10^6.

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

%e See A061955 for example.

%t b = 18; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[Reverse[IntegerDigits[#, b]], c], b], #] &] (* _Robert Price_, Mar 09 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 a(9)-a(13) from

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

%E a(9)-a(13) from _Lars Blomberg_, Aug 02 2011

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Last modified September 21 07:45 EDT 2024. Contains 376083 sequences. (Running on oeis4.)