188501

Appears in sequences

• Strong pseudoprimes to base 45.at n=27A020271
• Strong pseudoprimes to base 56.at n=27A020282
• Strong pseudoprimes to base 80.at n=35A020306
• Octagonal numbers (A000567) that are semiprimes (A001358).at n=23A259677
• Coefficient of x^2 in minimal polynomial of the continued fraction [1^n,1/2,1,1,1,...], where 1^n means n ones.at n=13A266699
• On a spirally numbered square grid, with labels starting at 1, this is the number of the last cell that a (1,n) leaper reaches before getting trapped, or -1 if it never gets trapped.at n=9A323471
• Triangle read by rows: T(m,n) is the label of the ending square of an (m,n)-leaper (a generalization of a chess knight) when it can no longer move, starting on a board with squares spirally numbered, starting at 1; 1 <= n < m. Each move is to the lowest-numbered unvisited square.at n=36A323750
• Intersection of A327653 and A327654.at n=32A327655