70645

Appears in sequences

• Numbers k such that (k, sigma(k)) lies on a circle with integral radius centered at the origin, i.e., k^2 + sigma(k)^2 is a square.at n=34A066764
• a(n) = floor(e*(n+3)!) - (n+3)*(n+2)*(n+1)*n*floor(e*(n-1)!).at n=38A080770
• A137576((k-1)/2) for composite numbers k from A141229.at n=5A140197
• a(n) = n^3 - 2*n^2 + 2*n + 1.at n=41A188947
• Replace 3^i with n^i in ternary representation of n.at n=40A193760
• Number of different ways to select disjoint nonempty subsets from {1..n} with equal element sum.at n=13A196534
• Number of cyclic subgroups of the group C_n x C_n x C_n x C_n, where C_n is the cyclic group of order n.at n=40A280184
• Number of maximal irredundant sets in the n-wheel graph.at n=28A291063