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.

Showing 1-2 of 2 results.

A343183 A343182(n) converted from base 2 to base 10.

Original entry on oeis.org

0, 4, 100, 27748, 1826909284, 7846656366854040676, 144745261873314177466380711909411548260, 49254260310842419635956203183145610297181518175722645092459215139793457671268
Offset: 0

Views

Author

N. J. A. Sloane, May 06 2021

Keywords

Crossrefs

Cf. A014577, A337580, A343181, A343182.

A343181 Binary word formed from first 2^n-1 terms of paper-folding sequence A014577.

Original entry on oeis.org

1, 110, 1101100, 110110011100100, 1101100111001001110110001100100, 110110011100100111011000110010011101100111001000110110001100100
Offset: 1

Views

Author

N. J. A. Sloane, May 05 2021

Keywords

Comments

Take a sheet of paper, and fold the right edge up and onto the left edge. Do this n times. and unfold. Write a 1 for every valley and a 0 for every ridge.
This appears on the first page of Davis-Knuth (1970/2010) and in many subsequent papers on paper-folding.
a(7) is too large to include in the DATA section.

References

  • Chandler Davis and Donald E. Knuth, Number Representations and Dragon Curves -- I and II, Journal of Recreational Mathematics, volume 3, number 2, April 1970, pages 66-81, and number 3, July 1970, pages 133-149. Reprinted in Donald E. Knuth, Selected Papers on Fun and Games, CSLI Publications, 2010, pages 571-614.
  • Rémy Sigrist and N. J. A. Sloane, Two-Dimensional Paper-Folding, Manuscript in preparation, May 2021.

Links

  • Chandler Davis and Donald E. Knuth, Number Representations and Dragon Curves, Journal of Recreational Mathematics, volume 3, number 2, April 1970, pages 66-81, and number 3, July 1970, pages 133-149. [Cached copy, with permission]

Crossrefs

When converted to base 10 we get A337580.
Cf. A014577, A343182.
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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