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 A192535 Monotonic ordering of set S generated by these rules: if x and y are in S then x^2+y^2+xy is in S, and 1 is in S. 2
 1, 3, 13, 27, 183, 217, 507, 757, 819, 1249, 2187, 33673, 34047, 36037, 39159, 47307, 47749, 50079, 53677, 100467, 120289, 141267, 257557, 258579, 263809, 271467, 383319, 414157, 573807, 575329, 583059, 594217, 671581, 673227, 681577 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS See A192476. LINKS MATHEMATICA start = {1}; f[x_, y_] := x^2 + y^2 + x*y b[x_] := Block[{w = x}, Select[Union[ Flatten[AppendTo[w, Table[f[w[[i]], w[[j]]], {i, 1, Length[w]}, {j, 1, i}]]]], # < 2000000 &]]; t = FixedPoint[b, start] (* A192535 *) CROSSREFS Cf. A192476. Sequence in context: A318368 A196014 A266215 * A002304 A117516 A075726 Adjacent sequences: A192532 A192533 A192534 * A192536 A192537 A192538 KEYWORD nonn AUTHOR Clark Kimberling, Jul 04 2011 STATUS approved

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Last modified December 2 08:36 EST 2022. Contains 358493 sequences. (Running on oeis4.)