A172504 - OEIS

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A172504

a(n) = denominator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form (n).(n)(n)(n)... with period (n).

1

9, 9, 3, 9, 9, 3, 9, 9, 1, 99, 9, 33, 99, 99, 33, 99, 99, 11, 99, 99, 33, 9, 99, 33, 99, 99, 11

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OFFSET

1,1

COMMENTS

Numerators in A172503.

Apparently the same as A172502. - R. J. Mathar, Feb 21 2010

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

a(10) = 99; 1000/99 = 10.10101010... (period 10).

a(9) = 1; 10/1 = 9.9999999...

CROSSREFS

Sequence in context: A083949 A007471 A180012 * A172502 A118739 A192031

Adjacent sequences: A172501 A172502 A172503 * A172505 A172506 A172507

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Feb 05 2010

STATUS

approved