A029500 Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 7 (most significant digit on right).

1, 3, 11, 16, 48, 480, 947, 1111, 1137, 1367, 2125, 6351, 6841, 8209, 11392, 32931, 166413, 173904, 263547, 284047, 634832, 690589, 2495931, 6696245, 7004640

Offset: 1

Author

Olivier Gérard

Keywords

• nonn
• base
• more

Comments

This sequence differs from A061936 in that all least significant zeros are kept during concatenation.

No more terms < 10^7. - Lars Blomberg, Oct 03 2011

Examples

			See A029495 for example.
		

Links

• Index entries for related sequences

Crossrefs

Cf. A029447-A029470, A029471-A029494, A029495-A029518, A029519-A029542, A061931-A061954, A061955-A061978.

Programs

Mathematica

b = 7; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[c, Reverse[IntegerDigits[#, b]]], b], #] &] (* Robert Price, Mar 12 2020 *)

Extensions

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

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

a(21)-a(25) from Lars Blomberg, Oct 03 2011