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 A323334 Sum of distinct products i*j*k with 1 <= i, j, k <= n. 2
 1, 15, 90, 310, 990, 2220, 5300, 9660, 17130, 28670, 52848, 75696, 128541, 183393, 257628, 344316, 529038, 683316, 1001110, 1256010, 1607004, 2049490, 2837700, 3330636, 4177186, 5150340, 6273810, 7432702, 9779991, 11124711, 14381168, 16610640, 19542393, 23032799, 26873769 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Michael S. Branicky, Table of n, a(n) for n = 1..2302 (terms 1..500 from Seiichi Manyama) EXAMPLE a(2) = 1 + 2 + 4 + 8 = 15. a(3) = 1 + 2 + 3 + 4 + 6 + 8 + 9 + 12 + 18 + 27 = 90. MATHEMATICA a[n_] := Table[i j k, {i, n}, {j, n}, {k, n}] // Flatten // Union // Total; Array[a, 35] (* Jean-François Alcover, Nov 25 2020 *) PROG (Python) def aupton(terms): alst, s, pset = [], 0, set() for n in range(1, terms): for i in range(1, n+1): for j in range(i, n+1): p = i*j*n # k = n if p not in pset: pset.add(p) s += p alst.append(s) return alst print(aupton(36)) # Michael S. Branicky, Jan 15 2021 CROSSREFS Column 3 of A321163. Cf. A027425. Sequence in context: A010822 A316224 A022707 * A151974 A179096 A328994 Adjacent sequences: A323331 A323332 A323333 * A323335 A323336 A323337 KEYWORD nonn AUTHOR Seiichi Manyama, Jan 11 2019 STATUS approved

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Last modified June 13 17:32 EDT 2024. Contains 373391 sequences. (Running on oeis4.)