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A112818 Numbers k such that lcm(1,2,3,...,k)/13 equals the denominator of the k-th harmonic number H(k). 12
156, 157, 158, 159, 160, 161, 27380, 27381, 27382, 27383, 27384, 27385, 27386, 27387, 27388, 27389, 27390, 27391, 27392, 27393, 27394, 27395, 27396, 27397, 27398, 27399, 27400, 27401, 27402, 27403, 27404, 27405, 27406, 27407, 27408 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
When 13 occurs in A110566.
LINKS
MATHEMATICA
a = h = 1; t = {}; Do[a = LCM[a, n]; h = h + 1/n; b = a/Denominator[h]; If[b == 13, AppendTo[t, n]], {n, 27408}]; t
With[{tk=Table[{LCM@@Range[k]/13, Denominator[HarmonicNumber[k]]}, {k, 28000}]}, Position[ tk, _?(#[[1]]==#[[2]]&), 1, Heads->False]]//Flatten (* Harvey P. Dale, Apr 02 2022 *)
CROSSREFS
Sequence in context: A057966 A247435 A299170 * A047635 A295221 A052477
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Sep 17 2005
EXTENSIONS
Definition corrected by Jinyuan Wang, May 03 2020
STATUS
approved

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Last modified March 28 16:12 EDT 2024. Contains 371254 sequences. (Running on oeis4.)