A192522 - OEIS

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.

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}]]]], # <