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A033623
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Grundy function for turn-at-most-4-coins game.
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5
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1, 2, 4, 8, 15, 16, 32, 51, 64, 85, 106, 128, 150, 171, 219, 237, 247, 256, 279, 297, 455, 512, 537, 557, 594, 643, 803, 863, 998, 1024, 1051, 1070, 1112, 1169, 1333, 1345, 1620, 1866, 2048, 2076, 2085, 2185, 2372
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| E. R. Berlekamp, J. H. Conway and R. K. Guy, Winning Ways, Table 3, page 433.
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FORMULA
| a(n)=smallest natural not the exclusive-or of at most three a(k) for k<n.
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CROSSREFS
| Cf. A000069, A054016, A054043, etc.
Sequence in context: A140117 A039743 A070008 * A094398 A026474 A082562
Adjacent sequences: A033620 A033621 A033622 * A033624 A033625 A033626
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KEYWORD
| nonn,nice,easy
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AUTHOR
| David A. Madore (david.madore(AT)ens.fr)
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EXTENSIONS
| More terms from N. J. A. Sloane (njas(AT)research.att.com) Apr 29, 2000
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