161211

Appears in sequences

• Numbers whose sum of digits s equals its product of digits and s + 1 and s - 1 are both prime.at n=27A061597
• a(n) = Sum_{k=1..n} k^floor((n-k)/k).at n=34A344551
• Number of distinct circles that can be constructed from an n X n square grid of points when each pair of points is connected by a circle and the points lie at the ends of a diameter of the circle.at n=28A360350