A029497 Numbers k such that k divides the (right) concatenation of all numbers <= k written in base 4 (most significant digit on right).

1, 2, 3, 11, 207, 1239, 7947, 9233, 49883, 118669, 315629, 2640670

Offset: 1

Author

Olivier Gérard

Keywords

• nonn
• base
• more

Comments

This sequence differs from A061933 in that all least significant zeros are kept during concatenation.

a(13) exceeds 10000000. - Sean A. Irvine, Sep 01 2009

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 = 4; 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(12) from Sean A. Irvine, Sep 01 2009