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.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A112821 Numbers n such that lcm(1,2,3,...,n)/19 equals the denominator of the n-th harmonic number H(n). 11
 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Positions where 19 occurs in A110566. LINKS Table of n, a(n) for n=1..18. Tanya Khovanova, Non Recursions MATHEMATICA a = h = 1; t = {}; Do[a = LCM[a, n]; h = h + 1/n; If[a/Denominator[h] == 19, AppendTo[t, n]], {n, 10^6}]; t Select[Range[500], Denominator[HarmonicNumber[#]]==LCM@@Range[#]/19&] (* Harvey P. Dale, Jan 29 2012 *) CROSSREFS Cf. A002805, A003418, A110566. Cf. A098464, A112813, A112814, A112815, A112816, A112817, A112818, A112819, A112820, A112822. Sequence in context: A035844 A028681 A005072 * A045130 A045269 A043395 Adjacent sequences: A112818 A112819 A112820 * A112822 A112823 A112824 KEYWORD nonn,more AUTHOR Robert G. Wilson v, Sep 17 2005 EXTENSIONS Definition corrected by Max Alekseyev, Mar 03 2007 STATUS approved

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.

Last modified May 27 23:15 EDT 2024. Contains 372899 sequences. (Running on oeis4.)