172170

Appears in sequences

• Number of walks of length n on square lattice, starting at origin, staying in first, second and third quadrants.at n=9A060898
• Numbers k such that k-1, k+1, k^2+1 and k^4+1 are all prime numbers.at n=16A070156
• Numbers k such that 2*6^k + 1 is prime.at n=35A120023
• Number of triangles larger than size=1 in a matchstick-made hexagon with side length n.at n=37A307253