19307236

Appears in sequences

• Number of nX2 0..4 arrays with no entry increasing mod 5 by 4 rightwards or downwards, starting with upper left zero.at n=6A222138
• Number of nX7 0..4 arrays with no entry increasing mod 5 by 4 rightwards or downwards, starting with upper left zero.at n=1A222143
• T(n,k) = number of n X k 0..4 arrays with no entry increasing mod 5 by 4 rightwards or downwards, starting with upper left zero.at n=29A222144
• Solutions of the equation n' = n + phi(n), where n' is the arithmetic derivative of n.at n=22A230545
• Numbers k such that the k-th cyclotomic polynomial has a root mod 13.at n=39A245481