login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A073100 Denominator of b(n) = n*sum(k=2^n,2^(n+1)-1,(-1)^k/k). 1
6, 210, 120120, 18050444111700, 118226688410282226751136160, 1112813007583117631616979100370019711878239390670756000, 1191035057635417333689929196555456096447880322064975132139675263681349241137859495385119040334214863238544000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

G. Vacca,"A new series for the Eulerian constant", Quart. J. Pure Appl. Math.,1910, vol. 41, p. 363-368

LINKS

Table of n, a(n) for n=1..7.

FORMULA

Sum( k>=1, b(k) ) = gamma =0, 5772.....

PROG

(PARI) a(n)=denominator( n*sum(k=2^n, 2^(n+1)-1, (-1)^k/k))

CROSSREFS

Cf. A001620, A073099.

Sequence in context: A238685 A099788 A126676 * A093536 A002037 A332989

Adjacent sequences:  A073097 A073098 A073099 * A073101 A073102 A073103

KEYWORD

easy,frac,nonn

AUTHOR

Benoit Cloitre, Aug 18 2002

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 April 9 04:05 EDT 2020. Contains 333343 sequences. (Running on oeis4.)