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A212244
Number of (w,x,y,z) with all terms in {1,...,n} and w + n = x*y*z.
2
0, 0, 3, 9, 13, 22, 31, 37, 48, 60, 69, 81, 93, 102, 118, 136, 142, 154, 178, 184, 202, 220, 229, 250, 265, 280, 295, 315, 333, 345, 372, 378, 400, 424, 433, 457, 481, 487, 511, 535, 550, 568, 595, 607, 625, 661, 676, 688, 712, 724, 757, 775, 787, 817
OFFSET
0,3
COMMENTS
For a guide to related sequences, see A211795.
MATHEMATICA
t = Compile[{{n, _Integer}}, Module[{s = 0},
(Do[If[w == x*y*z - n, s = s + 1],
{w, 1, #}, {x, 1, #}, {y, 1, #}, {z, 1, #}] &[n]; s)]];
Map[t[#] &, Range[0, 60]] (* A212244 *)
(* Peter J. C. Moses, Apr 13 2012 *)
CROSSREFS
Cf. A211795.
Sequence in context: A287184 A197569 A118570 * A004617 A135370 A206802
KEYWORD
nonn
AUTHOR
Clark Kimberling, May 08 2012
STATUS
approved