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A076780
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Let u(1)=u(2)=1, u(n)=(2^floor(u(n-1)/2)+1)/u(n-2) then a(n) = denominator of u(n).
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1
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1, 1, 2, 3, 3, 1, 4, 1, 9, 1, 8, 2, 27, 3, 8, 4, 9, 9, 4, 8, 3, 27, 2, 8, 1, 9, 1, 4, 1, 3, 3, 2, 1, 1, 1, 1, 1, 1, 2, 3, 3, 1, 4, 1, 9, 1, 8, 2, 27, 3, 8, 4, 9, 9, 4, 8, 3, 27, 2, 8, 1, 9, 1, 4, 1, 3, 3, 2, 1, 1, 1, 1, 1, 1, 2, 3, 3, 1, 4, 1, 9, 1, 8, 2, 27, 3, 8, 4, 9, 9, 4, 8, 3, 27, 2, 8, 1, 9, 1, 4, 1, 3
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OFFSET
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1,3
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COMMENTS
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Sequence is 36-periodic
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LINKS
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Table of n, a(n) for n=1..102.
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FORMULA
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Period is (1, 1, 2, 3, 3, 1, 4, 1, 9, 1, 8, 2, 27, 3, 8, 4, 9, 9, 4, 8, 3, 27, 2, 8, 1, 9, 1, 4, 1, 3, 3, 2, 1, 1, 1, 1)
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CROSSREFS
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Cf. A076742.
Sequence in context: A087074 A136453 A114104 * A089283 A077941 A077990
Adjacent sequences: A076777 A076778 A076779 * A076781 A076782 A076783
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KEYWORD
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frac,nonn
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AUTHOR
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Benoit Cloitre, Nov 24 2002
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STATUS
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approved
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