Positive numbers l of the form l=A007913(4*k*m^3-k^4), where 1<=k<=5*l, 1<=m<=5*l.
2, 3, 5, 6, 11, 15, 23, 31, 35, 47, 51, 59, 86, 106, 107, 109, 110, 129, 143, 155, 167
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Sat Aug 28 20:31:02 CEST 2010 [seqfan] Solvability of equation x^3+y^3+z^3=0 in integers of real and imaginary quadratic fields