120447

Appears in sequences

• Numbers k that divide the alternating sum sigma(1) - sigma(2) + sigma(3) - sigma(4) + ... + ((-1)^(k+1))*sigma(k).at n=15A067931
• Number of (w,x,y,z) with all terms in {1,...,n} and w <= (geometric mean of x,y,z).at n=23A212143
• Number of vertices among all distinct circles that can be constructed from the 3 vertices and the equally spaced 3*n points placed on the sides of an equilateral triangle when every pair of the 3 + 3*n points are connected by a circle and where the points lie at the ends of the circle's diameter.at n=10A372731