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Search: id:A051724
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| 0, 1, 1, 1, 1, 5, 1, 7, 2, 3, 5, 11, 1, 13, 7, 5, 4, 17, 3, 19, 5, 7, 11, 23, 2, 25, 13, 9, 7, 29, 5, 31, 8, 11, 17, 35, 3, 37, 19, 13, 10, 41, 7, 43, 11, 15, 23, 47, 4, 49, 25, 17, 13, 53, 9, 55, 14, 19, 29, 59, 5, 61, 31, 21, 16, 65, 11, 67, 17, 23, 35, 71
(list; graph; listen)
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OFFSET
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0,6
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COMMENT
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Or, numerator of n/(n+12).
Multiplicative with a(2^e) = 2^max(0, e-2), a(3^e) = 3^(e-1), a(p^e) = p^e otherwise. David W. Wilson (davidwwilson(AT)comcast.net) Jun 12, 2005.
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REFERENCES
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R. L. Graham, D. E. Knuth and O. Patashnik, Concrete Mathematics. Addison-Wesley, Reading, MA, 1990, p. 269.
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FORMULA
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a(n) = n/GCD(n, 12). David W. Wilson (davidwwilson(AT)comcast.net) Jun 12, 2005.
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PROGRAM
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(Other) sage: [lcm(n, 12)/12for n in xrange(0, 72)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 09 2009]
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CROSSREFS
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Cf. A051724! [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 09 2009]
Cf. A051724.
A109053 [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 09 2009]
Sequence in context: A023890 A102778 A135544 this_sequence A084303 A011508 A158552
Adjacent sequences: A051721 A051722 A051723 this_sequence A051725 A051726 A051727
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KEYWORD
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nonn,easy,frac,mult
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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