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A070023
1/n has period 1 in base 10 (including terminating decimals).
6
1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 25, 30, 32, 36, 40, 45, 48, 50, 60, 64, 72, 75, 80, 90, 96, 100, 120, 125, 128, 144, 150, 160, 180, 192, 200, 225, 240, 250, 256, 288, 300, 320, 360, 375, 384, 400, 450, 480, 500, 512, 576, 600, 625, 640, 720, 750
OFFSET
1,2
FORMULA
a(n) = A070022(n)/11. Numbers of the form a*b*c where a is in {1, 3, 9}, b is a power of 2 and c is a power of 5.
EXAMPLE
12 is in the sequence since 1/12 = 0.08333333333...
11 is not since 1/11 = 0.0909090909...
10 is in, since 1/10 = 0.1000000... = 0.099999999...
MATHEMATICA
Select[Range[750], Length[RealDigits[1/#][[1, -1]]] <= 1 &] (* Amiram Eldar, Jun 12 2022 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Henry Bottomley, Apr 12 2002
STATUS
approved