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 A192539 Monotonic ordering of set S generated by these rules:  if x and y are in S then 2xy+floor(xy/2) is in S, and 1 is in S. 2
 1, 2, 5, 10, 12, 25, 30, 50, 60, 62, 75, 125, 150, 155, 187, 250, 300, 310, 312, 360, 375, 387, 467, 625, 750, 775, 780, 900, 935, 937, 967, 1167, 1250, 1500, 1550, 1560, 1562, 1800, 1860, 1875, 1935, 1937, 1950, 2250, 2335, 2337, 2342, 2417, 2917 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MATHEMATICA start = {1}; f[x_, y_] := 2 x*y + Floor[x*y/2] b[x_] :=   Block[{w = x},    Select[Union[      Flatten[AppendTo[w,        Table[f[w[[i]], w[[j]]], {i, 1, Length[w]}, {j, 1, i}]]]], # <       6000 &]]; t = FixedPoint[b, start] (* A192539 *) CROSSREFS Cf. A192476. Sequence in context: A182656 A090050 A274454 * A046462 A188025 A187949 Adjacent sequences:  A192536 A192537 A192538 * A192540 A192541 A192542 KEYWORD nonn AUTHOR Clark Kimberling, Jul 04 2011 STATUS approved

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Last modified September 16 08:18 EDT 2021. Contains 347469 sequences. (Running on oeis4.)