5536609

Appears in sequences

• Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=9A207602
• Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=23A208551
• Numbers k such that concat(k, sigma(k)) and concat(sigma(k), k) are both prime.at n=18A284642