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A200741
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Table of distinct numbers of the form v*w + w*u + u*v with 1 <= u <= v <= w <= n.
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5
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3, 3, 5, 8, 12, 3, 5, 7, 8, 11, 12, 15, 16, 21, 27, 3, 5, 7, 8, 9, 11, 12, 14, 15, 16, 19, 20, 21, 24, 26, 27, 32, 33, 40, 48, 3, 5, 7, 8, 9, 11, 12, 14, 15, 16, 17, 19, 20, 21, 23, 24, 26, 27, 29, 31, 32, 33, 35, 38, 39, 40, 45, 47, 48, 55, 56, 65, 75, 3, 5
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OFFSET
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1,1
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COMMENTS
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A100440(n) = number of terms in row n;
T(n,k) = T(n+1,k) for k <= A200742(n);
distinct terms per row of table in A200737.
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LINKS
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MATHEMATICA
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row[n_] := Table[v*w + w*u + u*v, {u, 1, n}, {v, u, n}, {w, v, n}] // Flatten // Union; Table[row[n], {n, 1, 6}] // Flatten (* Jean-François Alcover, Dec 04 2013 *)
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PROG
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(Haskell)
import Data.List (nub)
a200741 n k = a200741_tabl !! (n-1) !! (k-1)
a200741_row = nub . a200737_row
a200741_tabl = map a200741_row [1..]
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CROSSREFS
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KEYWORD
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nonn,tabf
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AUTHOR
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STATUS
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approved
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