13 cubes 4,9,16,25,36,46,64,81,100,121,144,169,196
Simply calculate the cubes of a few small numbers, and check which of them are in the desired range.
When it is of the form x3 + y3 or x3 - y3. x or y can have coefficients that are perfect cubes, or even ratios of perfect cubes eg x3 + (8/27)y3.
125,216,343,512
7 cubed is 343
13 cubes 4,9,16,25,36,46,64,81,100,121,144,169,196
Perfect cubes.
56 2,2,2,7 perfect cubes=1,8
Simply calculate the cubes of a few small numbers, and check which of them are in the desired range.
When it is of the form x3 + y3 or x3 - y3. x or y can have coefficients that are perfect cubes, or even ratios of perfect cubes eg x3 + (8/27)y3.
26
no
125,216,343,512
81
None at all, girlfriend! Besides, you look perfect the way you is!
100
90 degree angle/right triangle