

A085837


Denominators of unit fractions having nonterminating 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
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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(n1)+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/#], {{___, {__}}, 01}] &] (* From JeanFrançois Alcover, Nov 07 2011 *)


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



