Voozh

A070022

1/n has period 2 in base 10.

11, 22, 33, 44, 55, 66, 88, 99, 110, 132, 165, 176, 198, 220, 264, 275, 330, 352, 396, 440, 495, 528, 550, 660, 704, 792, 825, 880, 990, 1056, 1100, 1320, 1375, 1408, 1584, 1650, 1760, 1980, 2112, 2200, 2475, 2640, 2750, 2816, 3168, 3300, 3520, 3960, 4125

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

FORMULA

a(n) =11*A070023(n). Numbers of the form a*b*c where a is in {11, 33, 99}, b is a power of 2 and c is a power of 5.

EXAMPLE

176 is in the sequence since 1/176=0.00568181818181818...

MATHEMATICA

Select[Range[5000], Length[RealDigits[1/#][[1, -1]]]==2&] (* Harvey P. Dale, Oct 10 2011 *)

CROSSREFS