268559

Appears in sequences

• n*10^6-1, n*10^6-3, n*10^6-7 and n*10^6-9 are all prime.at n=25A064980
• Number of (n+1)X(4+1) 0..2 arrays with every 2X2 subblock summing to a prime and those sums nondecreasing in every row and column.at n=3A251463
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock summing to a prime and those sums nondecreasing in every row and column.at n=24A251467