A070923 a(n) is the smallest value >= 0 of the form x^3 - n^2.

0, 0, 4, 18, 11, 2, 28, 15, 0, 44, 25, 4, 72, 47, 20, 118, 87, 54, 19, 151, 112, 71, 28, 200, 153, 104, 53, 0, 216, 159, 100, 39, 307, 242, 175, 106, 35, 359, 284, 207, 128, 47, 433, 348, 261, 172, 81, 535, 440, 343, 244, 143, 40, 566, 459, 350, 239, 126, 11, 615, 496

Offset: 0

Author

Benoit Cloitre, May 20 2002

Keywords

• easy
• look
• nonn

Comments

a(n) = 0 if n is a cube (i.e., n is in A000578(k)).

a(n) = A181138(n) if n is not a cube. - Zak Seidov, Mar 26 2013

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A000290, A068527, A070929, A075847, A077110, A077111, A181138.

Formula

a(n) = ceiling(n^(2/3))^3 - n^2 = A077107(n)-n^2.

Extensions

a(0)=0 prepended by Alois P. Heinz, Mar 07 2022