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

Author

Jaroslav Krizek, Feb 05 2010

Keywords

• nonn

Comments

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

Examples

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