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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A061932 Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 3 (most significant digit on right, least significant zeros not written).

Original entry on oeis.org

1, 4, 7, 8, 11, 383, 1871, 3916, 7040, 10333, 56413, 63595, 248945, 988588, 3931771, 11027435
Offset: 1

Views

Author

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

Keywords

Comments

This sequence differs from A029496 in that all least significant zeros are removed before concatenation.
No more terms < 10^7. [Lars Blomberg, Oct 17 2011]

Examples

			See A061931 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[c, IntegerDigits[IntegerReverse[#, b], b]], b], #] &] (* Robert Price, Mar 07 2020 *)

Extensions

Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002
a(14)-a(15) from Lars Blomberg, Oct 17 2011
a(16) from Chai Wah Wu, Jul 28 2020
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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