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

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

Offset

1,2

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]

Links

Table of n, a(n) for n=1..10.

Index entries for related sequences

Example

See A029519 for example.

Mathematica

b = 4; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[IntegerReverse[#, b], b], c], b], #] &] (* Robert Price, Mar 13 2020 *)

Crossrefs

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

Sequence in context: A013408 A013412 A013410 * A272353 A012766 A012796

Adjacent sequences: A029518 A029519 A029520 * A029522 A029523 A029524

Keyword

nonn,base

Author

Olivier Gérard

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

Status

approved