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A030127
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Term at which n-Somos sequence first becomes nonintegral.
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1
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17, 19, 20, 22, 24, 27, 28, 30, 33, 34, 36, 39, 41, 42, 44, 46, 48, 51, 52, 55, 56, 58, 60, 62, 65, 66, 68, 70, 72, 75, 76, 78, 81, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 107, 108, 110, 112, 114, 116, 118, 120, 123, 124, 126, 129, 130, 132, 134, 136, 138
(list; graph; refs; listen; history; internal format)
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OFFSET
| 8,1
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COMMENTS
| A101591 lists the positions of the odd terms. - Paul D. Hanna (pauldhanna(AT)juno.com), Dec 08 2004
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REFERENCES
| R. H. Buchholz and R. L. Rathbun, "An infinite set of Heron triangles with two rational medians", Amer. Math. Monthly, 104 (1997), 107-115.
David Gale, "The strange and surprising saga of the Somos sequences", Math. Intelligencer 13(1) (1991), pp. 40-42.
J. L. Malouf, "An integer sequence from a rational recursion", Discr. Math. 110 (1992), 257-261.
R. M. Robinson, "Periodicity of Somos sequences", Proc. Amer. Math. Soc., 116 (1992), 613-619.
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LINKS
| Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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FORMULA
| For even terms, a(n) = 2*n, else a(n) = 2*n+1 when n is in A101591. - Paul D. Hanna (pauldhanna(AT)juno.com), Dec 08 2004
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CROSSREFS
| Cf. A101591.
Sequence in context: A156656 A130808 A194389 * A115849 A054484 A054796
Adjacent sequences: A030124 A030125 A030126 * A030128 A030129 A030130
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KEYWORD
| nonn
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com)
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EXTENSIONS
| More terms from Paul D. Hanna (pauldhanna(AT)juno.com), Dec 08 2004
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