login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A256955 Decimal expansion of the sum of the reciprocals of all positive integers with digits in strictly decreasing order (there are exactly 1022 such integers - see A009995). 0
3, 8, 9, 8, 4, 0, 6, 7, 3, 6, 9, 9, 9, 0, 5, 3, 6, 4, 7, 3, 4, 4, 5, 9, 6, 2, 6, 0, 7, 2, 4, 8, 7, 3, 7, 8, 3, 8, 4, 9, 6, 0, 2, 0, 4, 7, 9, 0, 3, 4, 1, 2, 5, 7, 4, 6, 8, 2, 7, 8, 5, 8, 6, 5, 1, 0, 8, 7, 8, 8, 6, 0, 4, 6, 9, 5, 6, 4, 8, 6, 3, 6, 3, 4, 7, 8, 6, 5, 6, 0, 1, 0, 6, 5, 8, 2, 6, 8, 8, 7, 7, 2, 8, 9 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Since there are only finitely many such numbers, the sum is rational.

LINKS

Table of n, a(n) for n=1..104.

EXAMPLE

2009584261...2790050791 (1292 digits)

-------------------------------------- = 3.8984067369990536473445962607....

5154886078...0332960000 (1291 digits)

PROG

(MAGMA) m:=&+[1/k: k in [A009995(n)]]; Reverse(Intseq(Floor(10^104*m)))

CROSSREFS

Cf. A009995, A117914.

Sequence in context: A079591 A179047 A185067 * A197040 A217870 A154927

Adjacent sequences:  A256952 A256953 A256954 * A256956 A256957 A256958

KEYWORD

nonn,base,cons

AUTHOR

Jaroslav Krizek, Apr 19 2015

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 16 20:35 EDT 2019. Contains 328103 sequences. (Running on oeis4.)