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Search: id:A100436
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| A100436 |
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Number of distinct products i*j*k for 1 <= i < j <= k <= n. |
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+0
5
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| 0, 1, 4, 10, 20, 27, 46, 61, 84, 101, 147, 163, 226, 256, 292, 331, 434, 472, 601, 655, 719, 785, 968, 1016, 1143, 1233, 1346, 1433, 1713, 1778, 2099, 2219, 2363, 2509, 2677, 2763, 3202, 3381, 3573, 3690, 4223, 4360, 4951, 5149, 5347, 5598, 6298, 6449
(list; graph; listen)
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OFFSET
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1,3
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MAPLE
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f:=proc(n) local i, j, k, t1; t1:={}; for i from 1 to n-1 do for j from i+1 to n do for k from j to n do t1:={op(t1), i*j*k}; od: od: od: t1:=convert(t1, list); nops(t1); end;
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MATHEMATICA
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f[n_] := Length[ Union[ Flatten[ Table[ i*j*k, {i, n}, {j, i + 1, n}, {k, j, n}]]]]; Table[ f[n], {n, 48}] (from Robert G. Wilson v Dec 14 2004)
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CROSSREFS
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Cf. A027425, A027430, A100435.
Adjacent sequences: A100433 A100434 A100435 this_sequence A100437 A100438 A100439
Sequence in context: A086176 A015789 A135280 this_sequence A009882 A100439 A008128
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KEYWORD
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nonn
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AUTHOR
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njas, Nov 21 2004
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 14 2004
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