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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
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
Sequence in context: A035844 A028681 A005072 * A045130 A045269 A043395
KEYWORD
nonn,more
AUTHOR
Robert G. Wilson v, Sep 17 2005
EXTENSIONS
Definition corrected by Max Alekseyev, Mar 03 2007
STATUS
approved

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