86520

Appears in sequences

• Numbers that can be expressed as the difference of the squares of primes in exactly seven distinct ways.at n=26A092003
• Where records occur in A122277.at n=3A122279
• Sequence is obtained from Catalan numbers (A000108) by taking the factorial of each digit and adding them up.at n=11A165163
• Second pentagonal numbers that are interprime.at n=30A205881
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 470", based on the 5-celled von Neumann neighborhood.at n=33A288496
• Place two n-gons with radii 1 and 2 concentrically, forming an annular area between them. Connect all the vertices with line segments that lie entirely within that area. Then a(n) is the number of vertices in that figure.at n=37A337701
• Triangle read by rows: T(n, k) = n! * 4^k * hypergeom([-k], [-n], 1/4).at n=30A375613