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A192648
Monotonic ordering of set S generated by these rules: if x and y are in S and x^2-y^2>0 then x^2-y^2 is in S, and 2 and 3 are in S.
2
2, 3, 5, 16, 21, 185, 231, 247, 252, 416, 432, 437, 2495, 4345, 7648, 10143, 13568, 17913, 19136, 26784, 29279, 33784, 33969, 34200, 34216, 34221, 52920, 53105, 53336, 53352, 53357, 60568, 60753, 60984, 61000, 61005, 63063, 63248, 63479
OFFSET
1,1
COMMENTS
See A192645.
LINKS
MATHEMATICA
start = {2, 3};
f[x_, y_] := If[MemberQ[Range[1, 150000], x^2 - y^2], x^2 - 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}]]]], # <
150000 &]];
t = FixedPoint[b, start] (* A192648 *)
CROSSREFS
Sequence in context: A248827 A273525 A274336 * A219339 A360695 A048112
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jul 06 2011
STATUS
approved