

A172506


a(n) = numerator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form (1)(2)(3)...(n1)(n).(1)(2)(3)...(n1)(n).


1




OFFSET

1,1


COMMENTS

Sequence of denominators: 10, 25, 1000, 5000, 20000, 15625, 10000000, 50000000, ... Conjecture: this sequence is not equal to the sequence A078257.


LINKS

Table of n, a(n) for n=1..8.


EXAMPLE

a(6) = 1929001929; 1929001929/15625 = 123456.123456.


CROSSREFS

Sequence in context: A012192 A012079 A180056 * A250551 A001280 A100445
Adjacent sequences: A172503 A172504 A172505 * A172507 A172508 A172509


KEYWORD

nonn


AUTHOR

Jaroslav Krizek, Feb 05 2010


STATUS

approved



