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!)
A226894 Position of n-th harmonic number H(n) in the joint ranking of {H(k)} and {log k}, for k >= 1; complement of A226896. 3

%I #11 Aug 18 2013 11:20:09

%S 3,6,9,12,14,17,20,23,25,28,31,34,37,39,42,45,48,50,53,56,59,62,64,67,

%T 70,73,75,78,81,84,87,89,92,95,98,101,103,106,109,112,114,117,120,123,

%U 126,128,131,134,137,139,142,145,148,151,153,156,159,162,164

%N Position of n-th harmonic number H(n) in the joint ranking of {H(k)} and {log k}, for k >= 1; complement of A226896.

%C If, in the definition, log k is replaced by g + log k, where g is the Euler-Mascheroni constant, then the position of H(n) is 2n, and limit[1/(H(n) - g - log n) - 2n] = 1/3.

%H Clark Kimberling, <a href="/A226894/b226894.txt">Table of n, a(n) for n = 1..1002</a>

%e log 1 < log 2 < H(1) < log 3 < log 4 < H(2) < ...

%t z = 300; h[n_] := N[HarmonicNumber[n], 100]; t1 = Table[h[n], {n, 1, z}]; t2 = Table[N[Log[n], 100], {n, 1, 3 z}]; t3 = Union[t1, t2]; p[n_] := Position[t3, h[n]]

%t Flatten[Table[p[n], {n, 1, 3 z}]] (* A226894 *)

%t Differences[%] (* A226895 *)

%t Complement[Range[z], %%] (* A226896 *)

%Y Cf. A001008(n)/A002805(n) (H(n)), A226895 (differences), A226896 (complement).

%K nonn,easy

%O 1,1

%A _Clark Kimberling_, Jun 21 2013

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 13 01:02 EDT 2024. Contains 372497 sequences. (Running on oeis4.)