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cubic numbers
A cubic number is a figurate number of the form .

Every sufficiently large number can be written as the sum of at most 7 positive cubes. Nine cubes are needed only for 9 and 239 and eight cubes are needed for 15 numbers, the largest being 454.

It is not presently know if for all sufficiently large less than 7 cubes are enough: 8042 is the largest known number which needs 7 cubes and Deshouillers et al. in 2000 conjectured that 7373170279850 is the largest integer that cannot be expressed as the sum of 4 nonnegative cubes.

Every multiple of 6 can be represented as a sum of 4 signed cubes, since Mahler proved that 1 has infinitely many representations as 3 signed cubes.

Every cube is the difference between the squares of two consecutive triangular numbers .

There is only one known palindromic cube whose base is not palindromic, i.e., 22013 = 10662526601.

The formula by Lambek & Moser gives the -th non-cube.

The first cubic numbers are 1, 8, 27, 64, 125, 216, 343, 512, 729, 1000, 1331, 1728, 2197, 2744, 3375, 4096, 4913, 5832, 6859, 8000 more terms

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