255678

Appears in sequences

• a(n) = 3*n*(n^2 + 3*n + 4).at n=43A280304
• Numbers n for which sigma(sigma(n)) = 3*sigma(n).at n=20A326181
• Irregular table read by rows: T(n,k) is the number of k-gons, k>=3, in a regular drawing of a complete bipartite graph where the vertex positions on each part equal the Farey series of order n.at n=41A359694