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A228804 Numbers which are not a denominator of a rational number having a continued fraction consisting entirely of 1s and 2s; complement of A228803. 2
6, 9, 14, 16, 20, 22, 23, 28, 32, 33, 35, 36, 38, 39, 42, 48, 51, 52, 53, 54, 57, 59, 60, 62, 66, 72, 77, 78, 82, 83, 84, 85, 86, 87, 88, 90, 92, 94, 95, 96, 102, 103, 107, 110, 113, 114, 118, 120, 122, 124, 125, 126, 127, 130, 132, 133, 134, 135, 136, 139 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Related to Zaremba's conjecture. - Charles R Greathouse IV, Sep 12 2013

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

t = Sort[Union[Denominator[Map[FromContinuedFraction, Flatten[Map[Tuples[{1, 2}, #] &, Range[15]], 1]]]]]; c = Complement[Range[200], t]

CROSSREFS

Cf. A228803, A228805.

Sequence in context: A155705 A267369 A177891 * A315975 A315976 A315977

Adjacent sequences: A228801 A228802 A228803 * A228805 A228806 A228807

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Sep 04 2013

STATUS

approved

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Last modified March 23 04:41 EDT 2023. Contains 361434 sequences. (Running on oeis4.)