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A211640 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2>n. 2
0, 1, 8, 26, 63, 124, 212, 339, 508, 722, 993, 1321, 1717, 2186, 2727, 3358, 4079, 4893, 5809, 6833, 7974, 9229, 10613, 12132, 13786, 15587, 17532, 19635, 21904, 24335, 26940, 29731, 32708, 35871, 39235, 42800, 46578, 50575, 54785, 59232 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

For a guide to related sequences, see A211422.

LINKS

Table of n, a(n) for n=0..39.

MATHEMATICA

t = Compile[{{n, _Integer}}, Module[{s = 0},

    (Do[If[w^2 + x^2 + y^2 > n, s = s + 1],

        {w, 1, #}, {x, 1, #}, {y, 1, #}] &[n]; s)]];

Map[t[#] &, Range[0, 80]]     (* A211640 *)

(* Peter J. C. Moses, Apr 13 2012 *)

CROSSREFS

Cf. A211422.

Sequence in context: A163121 A250352 A213039 * A002901 A213769 A301647

Adjacent sequences:  A211637 A211638 A211639 * A211641 A211642 A211643

KEYWORD

nonn

AUTHOR

Clark Kimberling, Apr 18 2012

STATUS

approved

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Last modified December 6 21:48 EST 2019. Contains 329809 sequences. (Running on oeis4.)