A192649 - OEIS

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A192649

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 1, 2, and 4 are in S.

1, 2, 3, 4, 5, 7, 8, 9, 12, 15, 16, 17, 21, 24, 31, 32, 33, 39, 40, 45, 48, 55, 56, 60, 63, 64, 65, 72, 77, 79, 80, 81, 95, 111, 112, 119, 127, 128, 129, 135, 140, 143, 144, 145, 152, 159, 161, 175, 176, 185, 192, 200, 207, 208, 209, 216, 221, 223, 224, 225, 231

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OFFSET

1,2

COMMENTS

See A192645.

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..10000

MATHEMATICA

start = {1, 2, 4};

f[x_, y_] := If[MemberQ[Range[1, 700], x^2 - y^2], x^2 - y^2]

b[x_] :=

Block[{w = x},