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A069858 1/n has period 4 in base 10. 0
101, 202, 303, 404, 505, 606, 808, 909, 1010, 1111, 1212, 1515, 1616, 1818, 2020, 2222, 2424, 2525, 3030, 3232, 3333, 3636, 4040, 4444, 4545, 4848, 5050, 5555, 6060, 6464, 6666, 7272, 7575, 8080, 8888, 9090, 9696, 9999, 10100, 11110, 12120, 12625 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

FORMULA

Numbers of the form a*b*c where a is in {101, 303, 909, 1111, 3333, 9999}, b is a power of 2 and c is a power of 5.

EXAMPLE

1212 is in the sequence since 1/1212=0.0008250825082508250825082508250....

MATHEMATICA

Select[Range[13000], Length[RealDigits[1/#][[1, -1]]]==4&] (* Harvey P. Dale, Jun 30 2017 *)

CROSSREFS

Cf. A027894, A003592, A069105, A070021, A070022, A070023.

Sequence in context: A134970 A081365 A138131 * A319744 A303575 A171798

Adjacent sequences:  A069855 A069856 A069857 * A069859 A069860 A069861

KEYWORD

base,nonn

AUTHOR

Henry Bottomley, May 02 2002

STATUS

approved

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Last modified September 20 04:06 EDT 2019. Contains 327212 sequences. (Running on oeis4.)