A029521 Numbers k such that k divides the (left) concatenation of all numbers <= k written in base 4 (most significant digit on right and removing all least significant zeros before concatenation).

1, 3, 15, 969, 1107, 136193, 538019, 2177475, 2799315, 5948555

Offset: 1

Author

Olivier Gérard

Keywords

• nonn
• base
• more

Comments

This sequence differs from A061957 in that all least significant zeros are removed before concatenation.

No more terms < 10^7. [Lars Blomberg, Sep 02 2011]

Examples

			See A029519 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[IntegerDigits[IntegerReverse[#, b], b], c], b], #] &] (* Robert Price, Mar 13 2020 *)

Extensions

Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002; Aug 25 2002

a(8)-a(10) from Lars Blomberg, Sep 02 2011