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Search: id:A078559
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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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+0
2
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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
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OFFSET
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1,1
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COMMENT
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a(n)=A054640(n)/A078558(n)
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REFERENCES
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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
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F. Smarandache, Only Problems, Not Solutions!.
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CROSSREFS
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Cf. A000203, A002110, A000005, A005867, A054640, A020492, A078558, A078560.
Sequence in context: A072179 A065811 A061514 this_sequence A088364 A022853 A059540
Adjacent sequences: A078556 A078557 A078558 this_sequence A078560 A078561 A078562
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KEYWORD
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nonn,frac
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Dec 06 2002
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EXTENSIONS
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Improved definition from Frank Adams-Watters (FrankTAW(AT)Netscape.net), Dec 02 2005
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