A211431 Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w^3+(x+y)^2=0.

1, 7, 13, 19, 27, 37, 47, 57, 67, 77, 87, 97, 107, 117, 131, 145, 159, 173, 187, 201, 215, 229, 243, 257, 271, 285, 299, 313, 327, 341, 355, 369, 385, 403, 421, 439, 457, 475, 493, 511, 529, 547, 565, 583, 601, 619, 637, 655, 673, 691, 709, 727, 745

Offset

0,2

Comments

For a guide to related sequences, see A211422.

Links

Table of n, a(n) for n=0..52.

Mathematica

t[n_] := t[n] = Flatten[Table[w^3 + (x + y)^2, {w, -n, n}, {x, -n, n}, {y, -n, n}]]
c[n_] := Count[t[n], 0]
t = Table[c[n], {n, 0, 80}] (* A211431 *)
(t - 1)/2                   (* integers *)

Crossrefs

Cf. A211422.

Sequence in context: A045115 A331830 A221027 * A299928 A096452 A258038

Adjacent sequences: A211428 A211429 A211430 * A211432 A211433 A211434

Keyword

nonn

Author

Clark Kimberling, Apr 10 2012

Status

approved