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A078559
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Numerator of product_{i=1}^n (p_i+1)/(p_i-1). Denominators are in A078560.
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1
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3, 6, 9, 12, 72, 84, 189, 21, 252, 270, 288, 304, 1596, 152, 3648, 49248, 295488, 1526688, 17302464, 622888704, 640191168, 1707176448, 10243058688, 23046882048, 23527025424, 599939148312, 47054050848, 2540918745792
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n)=A054640(n)/A078558(n)
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REFERENCES
| R. K. Guy, Unsolved Problems in Number Theory, B48.
F. Smarandache, "Only Problems, not Solutions!", Xiquan Publ., Phoenix-Chicago, 1993
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LINKS
| F. Smarandache, Only Problems, Not Solutions!.
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MATHEMATICA
| Numerator[Table[Product[(Prime[i] + 1)/(Prime[i] - 1), {i, n}], {n, 30}]] (* From Alonso del Arte, Aug 23 2011 *)
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CROSSREFS
| Cf. A000203, A002110, A000005, A005867, A054640, A020492, A078558, A078560.
Sequence in context: A072179 A065811 A061514 * A159908 A088364 A022853
Adjacent sequences: A078556 A078557 A078558 * A078560 A078561 A078562
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KEYWORD
| nonn,frac
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Dec 06 2002
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EXTENSIONS
| Improved definition from Frank Adams-Watters (FrankTAW(AT)Netscape.net), Dec 02 2005
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