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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
EXAMPLE
a(6) = 41152000000; 41152000000/333333 = 123456.123456123456... (period 123456).
CROSSREFS
Sequence in context: A013402 A013406 A183487 * A098722 A162677 A041767
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Feb 05 2010
STATUS
approved

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Last modified March 1 08:00 EST 2024. Contains 370430 sequences. (Running on oeis4.)