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A278065
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Relative of Hofstadter Q-sequence: a(n) = n for 1 <= n <= 13; a(n) = a(n-a(n-1)) + a(n-a(n-2)) for n > 13.
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18
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 3, 14, 15, 5, 16, 6, 7, 17, 19, 10, 8, 19, 23, 12, 20, 14, 25, 11, 24, 28, 16, 13, 17, 15, 27, 20, 20, 34, 27, 24, 12, 45, 17, 27, 28, 36, 22, 28, 33, 26, 37, 30, 29, 32, 37, 31, 24, 40, 46, 15, 52, 35
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OFFSET
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1,2
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COMMENTS
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Similar to Hofstadter's Q-sequence A005185 but with different starting values.
Much like the Hofstadter Q-sequence, it is not known if this sequence is defined for all positive n.
a(n) exists for n <= 3*10^7.
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LINKS
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MATHEMATICA
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a[n_] := a[n] = If[0 < n < 14, n, a[n-a[n-1]] + a[n-a[n-2]]];
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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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