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Search: id:A119686
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| A119686 |
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Numerator of Sum[ 1/(Prime[k]-1)^2, {k,1, n}]. |
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+0
7
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| 1, 5, 21, 193, 4861, 2443, 78401, 707209, 85701889, 4203312961, 841345613, 841819933, 4211020661, 4212763061, 2229320057669, 376856710434461, 317005189060740101, 317069381268836117, 317122432680485717
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics. Prime Sums.
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FORMULA
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a(n) = numerator[ Sum[ 1/(Prime[k]-1)^2, {k,1, n}]].
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MATHEMATICA
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Numerator[Table[Sum[1/(Prime[i]-1)^2, {i, 1, n}], {n, 1, 30}]]
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CROSSREFS
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Cf. A006093, A000040, A086242.
Sequence in context: A123334 A140196 A027160 this_sequence A141798 A015461 A101694
Adjacent sequences: A119683 A119684 A119685 this_sequence A119687 A119688 A119689
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KEYWORD
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frac,nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Jun 08 2006
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