128664

Appears in sequences

• Coordination sequence for (2,4,5) tiling of hyperbolic plane.at n=41A265060
• For 1<=x<=n, 1<=y<=n with gcd(x,y)=1, write 1 = gcd(x,y) = u*x+v*y with u,v minimal; a(n) = m^2*s, where s is the population variance of the values of v and m is the number of such values.at n=14A345693