OFFSET
1,2
COMMENTS
The factor n^4 is to ensure that a(n) is an integer.
A345433(n) = n^2*mu where mu is the mean of the values of |v|.
The population standard deviation sqrt(s) appears to grow linearly with n.
PROG
(Python)
from statistics import pvariance
from sympy.core.numbers import igcdex
def A345690(n): return pvariance(n**2*abs(v) for u, v, w in (igcdex(x, y) for x in range(1, n+1) for y in range(1, n+1)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Chai Wah Wu, Jun 24 2021
STATUS
approved