A172507 a(n) = numerator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form (n).(n).

11, 11, 33, 22, 11, 33, 77, 44, 99, 101, 1111, 303, 1313, 707, 303, 404, 1717, 909, 1919, 101, 2121, 1111, 2323, 606, 101, 1313, 2727, 707, 2929, 303

Offset

1,1

Comments

Sequence of denominators: 10, 25, 1000, 5000, 20000, 15625, 10000000, 50000000, ... Conjecture: this sequence is not equal to the sequence A078267.

Links

Table of n, a(n) for n=1..30.

Example

a(6) = 33; 33/5 = 6.6.

Crossrefs

Sequence in context: A152082 A070849 A124297 * A089766 A077699 A266705

Adjacent sequences: A172504 A172505 A172506 * A172508 A172509 A172510

Keyword

nonn

Author

Jaroslav Krizek, Feb 05 2010

Status

approved