OFFSET
1,2
COMMENTS
LINKS
Stefano Spezia, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = denominator(R(n)), with the rational (in lowest terms) R(n) = f(n) + (n - f(n)^2)/(2*f(n)) = (f(n) + n/f(n))/2 with f(n) := floor(sqrt(n)) = A000196(n), for n >= 1.
EXAMPLE
See A256097.
MATHEMATICA
A000196[n_]:=Floor[Sqrt[n]]; a[n_]:=Denominator[(A000196[n]+n/A000196[n])/2]; Array[a, 80](* Stefano Spezia, Feb 15 2025 *)
CROSSREFS
KEYWORD
nonn,easy,frac,changed
AUTHOR
Wolfdieter Lang, Mar 24 2015
EXTENSIONS
a(61)-a(80) from Stefano Spezia, Feb 15 2025
STATUS
approved