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A171413
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Complement of self-generating sequence A005244.
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1
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1, 4, 6, 7, 8, 10, 11, 12, 13, 15, 16, 18, 19, 20, 21, 22, 23, 24, 25, 28, 29, 30, 31, 32, 34, 35, 36, 37, 38, 39, 40, 42, 43, 45, 46, 47, 48, 49, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68, 70, 71, 72, 73, 74, 75, 76, 78, 79, 82, 83, 85, 86, 88
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OFFSET
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1,2
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COMMENTS
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A005244(n) = a self-generating sequence: start with 2, take all products of any 2 previous elements, subtract 1 and adjoin them to the sequence.
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LINKS
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MATHEMATICA
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f[s_, mx_] := Union[s, Select[Times @@@ Subsets[s, {2}] - 1, # <= mx &]]; mx = 99; Complement[Range[mx], FixedPoint[f[#, mx] &, {2, 3}]] (* T. D. Noe, Mar 30 2011 *)
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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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