login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A117920 Number of digits in the decimal expansion of the regular unit fractions 1/A003592. 4
1, 2, 1, 3, 1, 4, 2, 2, 5, 3, 2, 6, 4, 2, 3, 7, 5, 3, 3, 8, 6, 4, 3, 9, 4, 7, 5, 3, 10, 4, 8, 6, 4, 11, 4, 9, 5, 7, 5, 12, 4, 10, 5, 8, 6, 13, 4, 11, 5, 9, 6, 7, 14, 5, 12, 5, 10, 6, 8, 15, 6, 13, 5, 11, 6, 9, 16, 7, 7, 14, 5, 12, 6, 10, 17, 7, 8, 15, 6, 13, 6, 11, 18, 7, 9, 16, 8, 7, 14, 6, 12, 19 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,2
LINKS
Eric Weisstein's World of Mathematics, Regular Number
EXAMPLE
1/A003592(2) = 1/2 = 0.5, with 1 digit after the decimal point, so a(2) = 1.
MATHEMATICA
digNum[n_] := Length[(dig = RealDigits[1/n, 10])[[1]]] - dig[[2]]; s = {}; m = 12; Do[n = 5^k; While[n <= 5^m, AppendTo[s, n]; n *= 2], {k, 0, m}]; Rest[digNum /@ Union[s]] (* Amiram Eldar, Feb 08 2020 *)
CROSSREFS
Cf. A003592.
Sequence in context: A323638 A249336 A067004 * A079617 A079616 A292587
KEYWORD
nonn,base
AUTHOR
Eric W. Weisstein, Apr 02 2006
EXTENSIONS
Offset corrected by Amiram Eldar, Feb 08 2020
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 22 20:09 EDT 2024. Contains 374540 sequences. (Running on oeis4.)