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A001474
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w such that w^3+x^3+y^3+z^3=0, w>|x|>|y|>|z|, is soluble.
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0
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6, 9, 12, 16, 19, 20, 25, 27, 28, 29, 34, 39, 40, 41, 44, 46, 51, 53, 54, 55, 58, 60, 67, 69, 70, 71, 72, 75, 76, 80, 81, 82, 84, 85, 87, 88, 89, 90, 93, 94, 96, 97, 98, 99, 102, 103, 105, 108, 109, 110, 111, 113, 115, 116, 120, 121, 122, 123, 126, 127, 129, 132, 134, 137, 139
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OFFSET
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1,1
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REFERENCES
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J. Leech, Some solutions of Diophantine equations, Proc. Camb. Phil. Soc., 53 (1957), 778-780, see p. 799.
H. W. Richmond, On integers which satisfy ..., Trans. Camb. Phil. Soc., 22 (1920), 389-403, see p. 402.
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LINKS
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MATHEMATICA
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sol[w_] := Reap[ Do[ If[ GCD[w, x, y, z] == 1 && w > Abs[x] > Abs[y] > Abs[z] && w^3 + x^3 + y^3 + z^3 == 0, Print[{w, x, y, z}]; Sow[{w, x, y, z}]; Break[]], {x, -w+1, -1}, {y, x+1, -1}, {z, y+1, -y-1}]][[2]]; Select[ Range[140], sol[#] =!= {} & ] (* Jean-François Alcover, Feb 24 2012 *)
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CROSSREFS
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KEYWORD
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nonn,nice
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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