OFFSET
1,1
COMMENTS
The asymptotic density of this sequence is 1 (Wu and Chen, 2019).
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
Bing-Ling Wu and Yong-Gao Chen, On the denominators of harmonic numbers, II, Journal of Number Theory, Vol. 200 (2019), pp. 397-406.
MATHEMATICA
d[n_] := Denominator @ Sum[(-1)^(k + 1)/k, {k, 1, n}]; Position[Partition[d[Range[120]], 2, 1], {x_, x_}] // Flatten
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Jan 29 2021
STATUS
approved