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A172505 a(n) = numerator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form (1)(2)(3)...(n-1)(n).(1)(2)(3)...(n-1)(n)... with period (1)(2)(3)...(n-1)(n). 1
10, 400, 41000, 12340000, 411500000, 41152000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Sequence of denominators: 9, 33, 333, 9999, 33333, 333333, ... Conjecture: this sequence is not equal to the sequence A172498.

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

a(6) = 41152000000; 41152000000/333333 = 123456.123456123456... (period 123456).

CROSSREFS

Sequence in context: A013402 A013406 A183487 * A098722 A162677 A041767

Adjacent sequences:  A172502 A172503 A172504 * A172506 A172507 A172508

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Feb 05 2010

STATUS

approved

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Last modified January 21 21:20 EST 2022. Contains 350480 sequences. (Running on oeis4.)