cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A061956 Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 3 (most significant digit on right).

Original entry on oeis.org

1, 4, 7, 11, 56, 104, 340, 17467, 19136, 125533, 230857
Offset: 1

Views

Author

Larry Reeves (larryr(AT)acm.org), May 24 2001

Keywords

Comments

This sequence differs from A029520 in that all least significant zeros are kept during concatenation.
No more terms < 10^7. [Lars Blomberg, Aug 28 2011]

Examples

			See A061955 for example.

Links

Crossrefs

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

Programs

  • Mathematica
    b = 3; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[Reverse[IntegerDigits[#, b]], c], b], #] &] (* Robert Price, Mar 07 2020 *)

Extensions

Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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