A212059 Number of (w,x,y,z) with all terms in {1,...,n} and w=x*y*z-1.

0, 0, 3, 9, 12, 21, 24, 34, 40, 49, 52, 70, 73, 82, 91, 106, 109, 127, 130, 148, 157, 166, 169, 199, 205, 214, 224, 242, 245, 272, 275, 296, 305, 314, 323, 359, 362, 371, 380, 410, 413, 440, 443, 461, 479, 488, 491, 536, 542, 560, 569, 587, 590, 620

Offset: 0

Author

Clark Kimberling, Apr 30 2012

Keywords

• nonn

Comments

For a guide to related sequences, see A211795.

Crossrefs

Cf. A211795.

Programs

Mathematica

t = Compile[{{n, _Integer}}, Module[{s = 0},
(Do[If[w == x*y*z - 1, s = s + 1],
{w, 1, #}, {x, 1, #}, {y, 1, #}, {z, 1, #}] &[n]; s)]];
Map[t[#] &, Range[0, 60]] (* A212059 *)
(* Peter J. C. Moses, Apr 13 2012 *)