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Search: id:A066401
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| A066401 |
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Square root of b_1*b_2*...*b_t corresponding to smallest values of t in Ron Graham's sequence (A006255). |
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+0
3
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| 1, 6, 12, 2, 20, 24, 28, 120, 3, 180, 66, 60, 78, 1260, 360, 4, 102, 108, 152, 120, 126, 132, 184, 144, 5, 936, 5040, 1120, 232, 210, 248, 240, 9240, 2040, 1680, 6, 370, 342, 312, 300, 410, 336, 430, 330, 360, 414, 470, 360, 7, 420, 25704, 196560, 636, 3780
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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R. L. Graham, Bijection between integers and composites, Problem 1242, Math. Mag., 60 (1980), 180.
R. L. Graham, D. E. Knuth and O. Patashnik, Concrete Mathematics. Addison-Wesley, Reading, MA, 1990, p. 147.
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EXAMPLE
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a(2) = 6 because the best such sequence is 2,3,6 for which the product is 36 = 6^2.
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CROSSREFS
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Cf. A006255, A066400.
Sequence in context: A028584 A110645 A064913 this_sequence A076590 A113660 A122859
Adjacent sequences: A066398 A066399 A066400 this_sequence A066402 A066403 A066404
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Dec 25, 2001
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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), Jan 06 2005
More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 18 2006
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