4289041

Appears in sequences

• Number of n X 5 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 1 vertically.at n=17A208115
• Number of length 2+4 0..n arrays with some pair in every consecutive five terms totalling exactly n.at n=13A246894
• Numbers k such that concat(k, sigma(k)) and concat(sigma(k), k) are both prime.at n=15A284642