A228804 - OEIS

A228804

Numbers which are not a denominator of a rational number having a continued fraction consisting entirely of 1s and 2s; complement of A228803.

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: A177891 A370125 A367947 * A315975 A315976 A315977

Adjacent sequences: A228801 A228802 A228803 * A228805 A228806 A228807

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Sep 04 2013

STATUS

approved