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1, 2, 5, 11, 12, 23, 24, 25, 26, 27, 50, 51, 52, 53, 54, 55, 56, 57, 58, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 477, 478, 479, 480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495
(list;
graph;
refs;
listen;
history;
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internal format)
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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a[n_] := a[n] = If[n <= 2, 1, a[a[n - 1]] + a[n - a[n - 1]]]; With[{nn = 500}, Function[s, Select[Range@ nn, a@ # == s[[#]] &]]@ Table[BitXor[a[#], a[n - #]] &@ a[n - 1] + Boole[n <= 2], {n, nn}]] (* Michael De Vlieger, Mar 18 2017, after Robert G. Wilson v at A004001 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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