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A212059 Number of (w,x,y,z) with all terms in {1,...,n} and w=x*y*z-1. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

For a guide to related sequences, see A211795.

LINKS

Table of n, a(n) for n=0..53.

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 *)

CROSSREFS

Cf. A211795.

Sequence in context: A096726 A272027 A310323 * A226152 A155504 A270672

Adjacent sequences:  A212056 A212057 A212058 * A212060 A212061 A212062

KEYWORD

nonn

AUTHOR

Clark Kimberling, Apr 30 2012

STATUS

approved

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Last modified April 10 10:39 EDT 2021. Contains 342845 sequences. (Running on oeis4.)