A064565 Reciprocal of n terminates with an infinite repetition of digit 6. Multiples of 10 are omitted.

6, 15, 24, 96, 375, 384, 1536, 6144, 9375, 24576, 98304, 234375, 393216, 1572864, 5859375, 6291456, 25165824, 100663296, 146484375, 402653184, 1610612736, 3662109375, 6442450944, 25769803776, 91552734375, 103079215104

Offset

1,1

References

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

Links

Table of n, a(n) for n=1..26.

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

Formula

Numbers of the form 3*2^(2i+1) and 3*5^(2i+1) [i >= 0].

Example

1/6291456 = 0.0000001589457194010416666666666...

Mathematica

Module[{r5=20, r2}, r2=Ceiling[r5*Log[2, 5]]; Flatten[{3*2^Range[ 1, r2, 2], 3*5^Range[ 1, r5, 2]}]]//Sort (* Harvey P. Dale, Oct 15 2017 *)

Prog

(ARIBAS): a064560(1, 500000000, 6, 36). For definition of a064560 see A064560.

Crossrefs

Cf. A064560, A064561, A064562, A064563, A064564, A064566, A064567.

Sequence in context: A341007 A345959 A242405 * A190515 A051940 A020207

Adjacent sequences: A064562 A064563 A064564 * A064566 A064567 A064568

Keyword

nonn,base

Author

Patrick De Geest, Sep 20 2001

Extensions

More terms from Klaus Brockhaus, Sep 21 2001

Further terms from James A. Sellers, Sep 28 2001

Status

approved