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).

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

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