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A274374
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Products of 2 distinct Fibonacci numbers and products of two distinct Lucas numbers (without 2), arranged in increasing order.
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3
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0, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 18, 21, 24, 26, 28, 29, 33, 34, 39, 40, 42, 44, 47, 54, 55, 63, 65, 68, 72, 76, 77, 87, 89, 102, 104, 105, 110, 116, 123, 126, 141, 144, 165, 168, 170, 178, 188, 198, 199, 203, 228, 233, 267, 272, 273, 275, 288
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OFFSET
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1,2
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COMMENTS
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Are 3 and 21 the only numbers that are a product of two distinct Fibonacci numbers and also a product of two distinct Lucas numbers?
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LINKS
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MATHEMATICA
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z = 400; f[n_] := Fibonacci[n];
s = Join[{0}, Take[Sort[Flatten[Table[f[m] f[n], {n, 2, z}, {m, 2, n - 1}]]], z]]
g[n_] := LucasL[n]; t = Take[Sort[Flatten[Table[g[u] g[v], {u, 1, z}, {v, 1, u - 1}]]], z]
Union[s, t]
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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