64710

Appears in sequences

• Numbers n such that pi(n) = (1/10)*n.at n=7A165689
• The number of regions inside a concave circular triangle formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.at n=19A340685
• G.f. A(x) satisfies A(x) = 1/( (1 - x*A(x)^2) * (1 - x*A(x)) )^2.at n=5A379282