23422

Appears in sequences

• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=1, r=5, I={4}.at n=16A079967
• a(n+1)-+a(n)=prime, a(n+1)*a(n)=Average of twin prime pairs, a(1)=3,a(2)=10.at n=37A154496
• Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 3,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid.at n=8A155343
• Number of 0..2 arrays x(0..n+1) of n+2 elements without any interior element greater than both neighbors.at n=8A200880
• Number of n X 1 0..2 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor.at n=11A202882
• Number of n X 2 0..2 arrays with no element less than a strict majority of its horizontal and antidiagonal neighbors.at n=5A232017
• T(n,k)=Number of nXk 0..2 arrays with no element less than a strict majority of its horizontal and antidiagonal neighbors.at n=26A232023
• Number of 6Xn 0..2 arrays with no element less than a strict majority of its horizontal and antidiagonal neighbors.at n=1A232028
• Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.at n=3A252313
• Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.at n=3A252317
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.at n=24A252321
• Product of n-th prime and the sum of the divisors of n.at n=51A272211
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 931", based on the 5-celled von Neumann neighborhood.at n=25A273790