238591

Properties

Appears in sequences

• Number of free polyominoes (or square animals) with n cells.at n=13A000105
• Triangle read by rows: T(n,k) (n>=1) gives the number of n-indecomposable polyominoes with k cells (k >= n).at n=78A125753
• Triangle read by rows: T(n,k) (n>=1) gives the number of n-indecomposable polyominoes with k cells (k >= n).at n=103A125753
• Triangle read by rows: T(n,k) (n>=1) gives the number of n-indecomposable polyominoes with k cells (k >= 1).at n=78A125761
• Triangle read by rows: T(n,k) (n>=1) gives the number of n-indecomposable polyominoes with k cells (k >= 1).at n=103A125761
• Number of free polyominoes with 2n-1 cells.at n=6A210997
• Primes which have the same (base 10) digital sum A007953 as the next smaller and next larger prime.at n=12A217875
• Number of prime polyominoes with n cells.at n=13A342430
• Prime numbersat n=21109