8743849

Appears in sequences

• Number of n X 2 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column.at n=7A207009
• T(n,k)=Number of nXk 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column.at n=37A207015
• T(n,k)=Number of nXk 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal.at n=37A207228
• T(n,k)=Number of nXk 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal.at n=37A207235
• Numbers k such that concat(k, d(k)) and concat(d(k), k) are both prime, where d(k) is the number of divisors of k.at n=33A284643