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 A076780 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). 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, 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Sequence is 36-periodic LINKS FORMULA 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) CROSSREFS Cf. A076742. Sequence in context: A087074 A136453 A114104 * A324733 A274604 A089283 Adjacent sequences:  A076777 A076778 A076779 * A076781 A076782 A076783 KEYWORD frac,nonn AUTHOR Benoit Cloitre, Nov 24 2002 STATUS approved

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Last modified October 22 10:20 EDT 2019. Contains 328317 sequences. (Running on oeis4.)