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A085837 Denominators of unit fractions having non-terminating decimal expansions. 5
3, 6, 7, 9, 11, 12, 13, 14, 15, 17, 18, 19, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 81, 82, 83, 84 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement of A003592.

LINKS

Table of n, a(n) for n=1..70.

Eric Weisstein's World of Mathematics, Repeating Decimal

EXAMPLE

1/3=0.3333..., 1/6=0.16666..., 1/7=0.142857142857..., ...

MAPLE

isA085837 := proc(n)

        return (numtheory[factorset](n) minus {2, 5} <> {} );

end proc:

A085837 := proc(n)

    option remember;

    if n = 1 then

        3;

    else

        for a from procname(n-1)+1 do

            if isA085837(a) then

                return a;

            end if;

        end do:

    end if;

end proc: # R. J. Mathar, Jul 16 2012

MATHEMATICA

Select[ Range[84], MatchQ[ RealDigits[1/#], {{___, {__}}, 0|-1}] &] (* From Jean-François Alcover, Nov 07 2011 *)

Select[Range[100], Depth[RealDigits[1/#]]>3&] (* Harvey P. Dale, May 28 2015 *)

CROSSREFS

Cf. A003592.

Sequence in context: A138933 A071530 A005767 * A176237 A187811 A186348

Adjacent sequences:  A085834 A085835 A085836 * A085838 A085839 A085840

KEYWORD

nonn,easy,nice,base

AUTHOR

Eric W. Weisstein, Jul 04 2003

EXTENSIONS

Definition corrected by Robert Israel, Jul 09 2014

STATUS

approved

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Last modified December 4 17:40 EST 2016. Contains 278755 sequences.