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A014440
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Differences between two positive cubes in exactly 2 ways.
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11
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721, 728, 999, 5768, 5824, 5859, 7992, 8911, 9919, 10621, 12663, 12824, 19467, 19656, 23877, 25669, 26973, 27937, 28063, 34209, 35208, 35929, 41743, 43561, 46144, 46592, 46872, 49959, 53144, 63936, 68857, 68913, 71288, 77779, 79352, 80379, 84968, 90125
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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r = 90125; p = 3; Sort@Drop[Flatten@Select[Tally@Reap[Do[n = i^p - j^p; If[n <= r, Sow[n]], {i, Ceiling[(r/p)^(1/(p - 1))]}, {j, i}]][[2, 1]], #[[2]] == 2 &], {2, -1, 2}] (* Arkadiusz Wesolowski, Dec 10 2015 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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Glen Burch (gburch(AT)erols.com)
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EXTENSIONS
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STATUS
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approved
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