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Search: id:A027429
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| A027429 |
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Number of distinct products ijk with 0 <= i<j<k <= n. |
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+0
2
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| 0, 0, 1, 2, 5, 11, 17, 30, 43, 61, 76, 112, 127, 178, 207, 239, 275, 362, 397, 508, 555, 614, 678, 839, 884, 1005, 1093, 1199, 1278, 1530, 1591, 1882, 1999, 2134, 2276, 2433, 2519, 2922, 3097, 3279, 3392, 3885, 4015, 4564, 4751, 4939, 5187, 5841, 5988, 6423
(list; graph; listen)
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OFFSET
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0,4
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..200
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FORMULA
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a(n)=A027430(n)+1. - T. D. Noe, Jan 16 2007
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EXAMPLE
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a(3)=2 (0 and 6 being the only products) and a(4)=5 (with products 0,6,8,12, and 24).
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MATHEMATICA
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nn=50; prod=Table[0, {1+nn^3}]; t=Table[Do[prod[[1+i*j*k]]=1, {i, 0, n}, {j, i+1, n}, {k, j+1, n}]; Count[Take[prod, 1+n^3], 1], {n, 0, nn}] - T. D. Noe (noe(AT)sspectra.com), Jan 16 2007
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CROSSREFS
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Cf. A027425. A027426.
Adjacent sequences: A027426 A027427 A027428 this_sequence A027430 A027431 A027432
Sequence in context: A055499 A014424 A023228 this_sequence A059987 A027426 A133928
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KEYWORD
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nonn
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AUTHOR
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njas
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EXTENSIONS
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Corrected by T. D. Noe (noe(AT)sspectra.com), Jan 16 2007
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