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A120287 Numerator of 1/n^3 + 2/(n-1)^3 + 3/(n-2)^3 +...+ (n-1)/2^3 + n. 0
1, 17, 355, 7715, 203413, 492527, 49601051, 1823359051, 16684019407, 186004308017, 22757931053507, 298630937704541, 50872538998767329, 51223731720255509, 103063783892301061, 7045407930432340853 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
p divides a(p-1) and a(p-2) for prime p>3.
LINKS
FORMULA
a(n) = numerator[Sum[Sum[1/i^3,{i,1,k}],{k,1,n}]].
MATHEMATICA
Numerator[Table[Sum[Sum[1/i^3, {i, 1, k}], {k, 1, n}], {n, 1, 25}]]
CROSSREFS
Sequence in context: A194729 A081421 A121824 * A222678 A293691 A365678
KEYWORD
frac,nonn
AUTHOR
Alexander Adamchuk, Jul 07 2006
STATUS
approved

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Last modified February 24 14:13 EST 2024. Contains 370303 sequences. (Running on oeis4.)