n = x^3 + y^3 + z^3

http://www.asahi-net.or.jp/~KC2H-MSM/mathland/math04/matb0100

http://www.alpertron.com.ar/FCUBES.HTM

http://oeis.org/A046041

http://mathworld.wolfram.com/CubicNumber.html

http://www.ams.org/journals/mcom/1969-23-106/S0025-5718-1969-0245513-1/S0025-5718-1969-0245513-1.pdf

Here we allow the cubes to be positive, negative, or zero. For example,

84 = 0^3 + 41639611^3 + (-41531726)^3 + (-8241191)^3.

148 = 67^3 + 1^3 - 56^3 - 50^3