The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A112286 a(n) = numerator of sum of reciprocals of the terms of the continued fraction for H(n) = Sum_{k=1..n} 1/k. 7

%I #12 Mar 23 2017 04:36:30

%S 1,3,11,7,71,7,17,152,2699,701,691,248,133,137,61933,809,20705,64896,

%T 3587,17449,445,61897,208,20663,1163,982,27281,1871,2466139,44339,

%U 21293609,13417971,6229,54238033,99737,3585191,33583,40756259,5956441

%N a(n) = numerator of sum of reciprocals of the terms of the continued fraction for H(n) = Sum_{k=1..n} 1/k.

%H G. C. Greubel, <a href="/A112286/b112286.txt">Table of n, a(n) for n = 1..1000</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HarmonicNumber.html">Harmonic Number</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ContinuedFraction.html">Continued Fraction</a>

%e 1 +1/2 +1/3 +1/4 +1/5 +1/6 = 49/20 = 2 + 1/(2 + 1/(4 + 1/2)).

%e So a(6) is 7, the numerator of 7/4 = 1/2 + 1/2 + 1/4 + 1/2.

%t f[n_] := Plus @@ (1/# &) /@ ContinuedFraction[Sum[1/k, {k, n}]]; Table[Numerator[f[n]], {n, 40}] (* _Ray Chandler_, Sep 06 2005 * )

%Y m-th harmonic number H(m) = A001008(m)/A002805(m).

%Y Cf. A055573, A058027, A100398, A110020, A112287.

%K nonn,frac

%O 1,2

%A _Leroy Quet_, Sep 01 2005

%E Extended by _Hans Havermann_ and _Ray Chandler_, Sep 06 2005

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 May 23 00:54 EDT 2024. Contains 372758 sequences. (Running on oeis4.)