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Search: id:A126937
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| A126937 |
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A dragon curve is drawn on an Ulam spiral; a(n) is the integer written in the cell reached at step n. |
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+0
5
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| 0, 1, 8, 7, 22, 21, 6, 19, 20, 41, 40, 19, 18, 39, 38, 67, 68, 105, 104, 67, 66, 37, 38, 17, 16, 37, 36, 35, 62, 63, 98, 99, 64, 101, 100, 99, 142, 141, 98, 97, 140, 139, 96, 97, 62, 61, 34, 33, 60, 61, 96, 95, 138, 137, 94, 93, 136, 137, 188, 187, 246, 247, 314, 315, 248
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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The spiral consists of the numbers 0, 1, 2, ... written in a spiral on squared paper. The dragon curve is a self-similar curve starting at the same point. See the illustration for more information.
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LINKS
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Philippe Lallouet, Spreadsheet with illustration of initial terms
Eric Weisstein's World of Mathematics, Dragon Curve [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 07 2008]
Eric Weisstein's World of Mathematics, Prime Spiral [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 07 2008]
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CROSSREFS
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Cf. A014577 (regular paper-folding [or dragon curve] sequence). [From Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 07 2008]
Adjacent sequences: A126934 A126935 A126936 this_sequence A126938 A126939 A126940
Sequence in context: A019326 A051011 A075573 this_sequence A090099 A138809 A038285
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KEYWORD
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nonn
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AUTHOR
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Philippe Lallouet (philip.lallouet(AT)wanadoo.fr), Mar 18 2007
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EXTENSIONS
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Edited by njas, Mar 28 2007
a(9) - a(64) from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Aug 07 2008
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