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Search: id:A069052
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| A069052 |
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Denominator of sum(i=1,n,1/i^5). |
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+0
6
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| 1, 32, 7776, 248832, 777600000, 259200000, 4356374400000, 139403980800000, 101625502003200000, 101625502003200000, 16366888723117363200000, 16366888723117363200000, 6076911214672415134617600000
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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If 1<=n<=19 a(n)=A007480(n)*A002805(n) =denominator(sum(i=1, n, 1/i^4))*denominator(sum(i=1, n, 1/i))
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MATHEMATICA
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s=0; lst={}; Do[s+=n^1/n^6; AppendTo[lst, Denominator[s]], {n, 3*4!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 24 2009]
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CROSSREFS
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Sequence in context: A071310 A028461 A016829 this_sequence A086752 A159679 A139568
Adjacent sequences: A069049 A069050 A069051 this_sequence A069053 A069054 A069055
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 03 2002
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