87066

Appears in sequences

• Numbers k such that the sum of the digits of sigma(k)^k is divisible by k.at n=19A109659
• Triangle read by rows: T(n,k) is the number of deco polyominoes of height n and vertical height (i.e., number of rows) k (1 <= k <= n). A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=42A121692
• Smallest number whose home prime (cf. A037274) is the home prime of exactly n natural numbers.at n=13A215408