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1, 1, 3, 1, 3, 3, 7, 3, 3, 3, 7, 5, 7, 9, 17, 9, 3, 3, 7, 5, 7, 9, 17, 11, 7, 9, 17, 17, 19, 23, 39, 27, 7, 3, 7, 5, 7, 9, 17, 11, 7, 9, 17, 17, 19, 23, 39, 29, 11, 9, 17, 17, 19, 25, 43, 39, 25, 23, 39, 45, 47, 57, 93, 77, 23, 3, 7, 5, 7, 9
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Also, first differences of A161910. [From Omar E. Pol (info(AT)polprimos.com), Jun 21 2009]
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LINKS
| David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
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EXAMPLE
| Note that this can be written as a triangle:
1;
1;
3;
1,3;
3,7,3,3;
3,7,5,7,9,17,9,3;
3,7,5,7,9,17,11,7,9,17,17,19,23,39,27,7;
3,7,5,7,9,17,11,7,9,17,17,19,23,39,29,11,9,17,17,19,25,43,39,25,23,39,45,47,57,93,77,23;
3,7,5,7,9,...
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CROSSREFS
| Y-toothpick sequence: A160120. Cf. A160121, A160122.
Cf. A139250, A139251. [From Omar E. Pol (info(AT)polprimos.com), Jun 16 2009]
Cf. A161831, A161427, A161910. [From Omar E. Pol (info(AT)polprimos.com), Jun 21 2009]
Sequence in context: A173465 A151837 A163381 * A147610 A133579 A163270
Adjacent sequences: A160120 A160121 A160122 * A160124 A160125 A160126
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KEYWORD
| nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), May 02 2009, May 21 2010
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EXTENSIONS
| More terms from Omar E. Pol (info(AT)polprimos.com), Jun 16 2009
Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 05 2010
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