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A003139
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Coprime chains with largest member n.
(Formerly M0129)
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1
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1, 1, 1, 1, 2, 1, 3, 1, 3, 2, 9, 1, 10, 2, 4, 3, 19, 1, 20, 2, 6, 4, 32, 1, 21, 7, 16, 7, 84, 1, 85, 9, 18, 11, 35, 3, 161, 15, 30, 6, 212, 2, 214, 15, 12, 19, 260, 3, 154, 11, 62, 31, 521, 5, 129
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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REFERENCES
| R. C. Entringer, The number of coprime chains with largest member n, Proc. Amer. Math. Soc., 16 (1965), 806-810.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Cf. A003140.
Sequence in context: A162912 A039776 A048864 * A145652 A111248 A100714
Adjacent sequences: A003136 A003137 A003138 * A003140 A003141 A003142
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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