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A064564 Reciprocal of n terminates with an infinite repetition of digit 5. Multiples of 10 are omitted. 0
18, 1152, 28125, 73728, 4718592, 301989888, 439453125, 19327352832, 1236950581248, 6866455078125, 79164837199872, 5066549580791808, 107288360595703125, 324259173170675712, 20752587082923245568 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, pps. 73-82.

LINKS

Table of n, a(n) for n=0..14.

Index entries for sequences related to decimal expansion of 1/n

FORMULA

Numbers of the form 9*2^(6i-5) and 9*5^(6i-1) [i>0].

EXAMPLE

E.g. 1/28125 = 0.000035555555555...

MATHEMATICA

With[{nn=20}, Take[Sort[Flatten[Table[{9 2^(6n-5), 9 5^(6n-1)}, {n, nn}]]], nn]] (* Harvey P. Dale, Oct 22 2013 *)

CROSSREFS

Cf. A064560-A064567.

Sequence in context: A159379 A052135 A033518 * A152933 A177602 A252969

Adjacent sequences:  A064561 A064562 A064563 * A064565 A064566 A064567

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Sep 20 2001.

EXTENSIONS

More terms from James A. Sellers, Sep 28 2001

STATUS

approved

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Last modified May 26 18:26 EDT 2017. Contains 287129 sequences.