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Search: id:A126147
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| A126147 |
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a(n) = floor[(product{k=1 to n-1} p(k))/p(n)], where p(n) is the n-th prime. |
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+0
1
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| 0, 0, 1, 4, 19, 177, 1766, 26868, 421725, 7692857, 208699781, 5420553787, 180993613044, 7075587523888, 278356624078085, 11601694011103611, 552358618257458385, 31520661477937912115, 1750572856110551805720
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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Every distict prime dividing ((product{k=1 to n-1} p(k)) (mod p(n))) also divides a(n).
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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MATHEMATICA
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f[n_] := Floor[ Product[ Prime@k, {k, n - 1}] / Prime@n]; Array[f, 19] - Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 07 2007
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CROSSREFS
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Cf. A062347, A002110.
Sequence in context: A007788 A067577 A155804 this_sequence A007411 A072879 A112958
Adjacent sequences: A126144 A126145 A126146 this_sequence A126148 A126149 A126150
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet Mar 07 2007
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 07 2007
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