OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..600
FORMULA
a(n) is asymptotic to Pi^2*n^2/4.
MATHEMATICA
a[1] = 1; a[n_] := a[n] = Module[{k = a[n - 1], s = 0}, While[(s += 1/Sqrt[k]) < Pi, k++]; k]; Array[a, 50] (* Amiram Eldar, May 19 2022 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Aug 23 2002
EXTENSIONS
a(1) = 1 inserted by Amiram Eldar, May 19 2022
STATUS
approved