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

Offset: 1

Author

Henry Bottomley, Apr 12 2002

Keywords

• base
• nonn

Examples

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

Crossrefs

Cf. A018282, A003592, A069105, A070021, A070023.

Programs

Mathematica

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

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.