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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

Table of n, a(n) for n=1..102.

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.)