The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A343181 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A343181

Binary word formed from first 2^n-1 terms of paper-folding sequence A014577.
(history; published version)

#10 by N. J. A. Sloane at Thu May 06 12:03:56 EDT 2021

STATUS

editing

approved

#9 by N. J. A. Sloane at Thu May 06 12:03:45 EDT 2021

COMMENTS

This appears on the first page of Davis-Knuth (1970/2010) and in many subsequent papers on paper-folding.

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.

STATUS

approved

editing

#8 by N. J. A. Sloane at Thu May 06 12:00:41 EDT 2021

STATUS

editing

approved

#7 by N. J. A. Sloane at Thu May 06 12:00:35 EDT 2021

CROSSREFS

Cf. A014577, A343182.

STATUS

approved

editing

#6 by N. J. A. Sloane at Wed May 05 01:19:27 EDT 2021

STATUS

editing

approved

#5 by N. J. A. Sloane at Wed May 05 01:19:25 EDT 2021

COMMENTS

a(7) is too large to include in the DATA section.

REFERENCES

Rémy Sigrist and N. J. A. Sloane, Two-Dimensional Paper-Folding, Manuscript in preparation, May 2021.

STATUS

approved

editing

#4 by N. J. A. Sloane at Wed May 05 01:11:43 EDT 2021

STATUS

editing

approved

#3 by N. J. A. Sloane at Wed May 05 01:11:40 EDT 2021

NAME

qqqq

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

DATA

1, 110, 1101100, 110110011100100, 1101100111001001110110001100100, 110110011100100111011000110010011101100111001000110110001100100, 1101100111001001110110001100100111011001110010001101100011001001110110011100100111011000110010001101100111001000110110001100100

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.

CROSSREFS

When converted to base 10 we get A337580.

Cf. A014577.

#2 by N. J. A. Sloane at Wed May 05 01:01:38 EDT 2021

NAME

allocated for N. J. A. Sloane

qqqq

DATA

OFFSET

1,2

KEYWORD

allocated

nonn

AUTHOR

N. J. A. Sloane, May 05 2021

STATUS

approved

editing

#1 by N. J. A. Sloane at Wed Apr 07 03:11:35 EDT 2021

NAME

allocated for N. J. A. Sloane

KEYWORD

allocated

STATUS

approved