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Search: id:A037092
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| A037092 |
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Number of triples {i,j,k}, i>1, j>1, k>1, such that ijk < n^3. |
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+0
3
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| 0, 7, 35, 104, 238, 482, 851, 1402, 2147, 3179, 4497, 6210, 8324, 10921, 14048, 17759, 22146, 27247, 33158, 39953, 47652, 56372, 66135, 77187, 89351, 102902, 117801, 134252, 152148, 171853, 193328, 216471, 241557, 268780, 298017, 329515
(list; graph; listen)
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OFFSET
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2,2
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FORMULA
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sum(sum(floor((n^3-1)/(ij))-j+1, j=i..floor(sqrt((n^3-1)/i))), i=2..n-1)
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EXAMPLE
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f(3)=7 because the only triples ijk < 27 are (2,2,2) (2,2,3) (2,2,4) (2,2,5) (2,2,6) (2,3,3) (2,3,4)
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CROSSREFS
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Cf. A037048.
Sequence in context: A077536 A152744 A130884 this_sequence A015667 A124090 A059595
Adjacent sequences: A037089 A037090 A037091 this_sequence A037093 A037094 A037095
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KEYWORD
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nonn
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AUTHOR
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Joe K. Crump (joecr(AT)carolina.rr.com)
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