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A192522 Monotonic ordering of set S generated by these rules:  if x and y are in S then floor((x-1)(y-1)/2) is in S, and 5 is in S. 2
5, 8, 14, 24, 26, 45, 46, 50, 80, 84, 87, 88, 90, 98, 149, 154, 157, 158, 162, 166, 171, 172, 174, 178, 194, 264, 276, 286, 287, 290, 292, 296, 301, 304, 306, 311, 312, 314, 318, 322, 330, 339, 340, 342, 346, 354, 386, 506, 513, 517, 518, 526, 535, 539 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..54.

MATHEMATICA

start = {5}; f[x_, y_] := Floor[(x - 1)*(y - 1)/2]

b[x_] :=

  Block[{w = x},

   Select[Union[

     Flatten[AppendTo[w,

       Table[f[w[[i]], w[[j]]], {i, 1, Length[w]}, {j, 1, i}]]]], # <

      1500 &]];

t = NestList[b, start, 12][[-1]] (* A192522 *)

Table[t[[i]] - t[[i - 1]], {i, 2, Length[t]}]  (* differences *)

CROSSREFS

Cf. A192476.

Sequence in context: A065394 A124011 A101835 * A133641 A164094 A246319

Adjacent sequences:  A192519 A192520 A192521 * A192523 A192524 A192525

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jul 03 2011

STATUS

approved

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Last modified April 14 19:29 EDT 2021. Contains 342951 sequences. (Running on oeis4.)