65902domain: NAppears in sequencesa(n) = 8^n mod 5^n.at n=7A138959a(n) = 1 + Sum_{k=0..n-1} binomial(n,k)^2 * a(k).at n=5A335946On a spirally numbered square grid, with labels starting at 1, this is the number of steps that an (n,n+1) leaper makes before getting trapped, or -1 if it never gets trapped.at n=29A343178