20924

Appears in sequences

• Numbers whose base-12 representation has exactly 5 runs.at n=29A043654
• Number of squares (of another matrix) in the group GL(2,Z_n) described in sequence A000252.at n=30A068516
• Numbers k such that A099850(k) is divisible by k.at n=8A099851
• Antidiagonal sums of table A122888.at n=12A122889
• Number of n-bead necklaces labeled with numbers 1..4 not allowing reversal, with no adjacent beads differing by more than 1.at n=12A208773
• Number of n X 2 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or two plus the sum of the elements diagonally to its northwest, modulo 4.at n=25A239844
• Number of partitions p of n such that median(p) < multiplicity(min(p)).at n=40A240212
• Numbers k such that 5*R_k + 7*10^k + 2 is prime, where R_k = 11...11 is the repunit (A002275) of length k.at n=13A259132
• Numbers k such that (2*10^k - 113)/3 is prime.at n=18A291922
• A(n, k) is the k-th number b > 1 such that b^(prime(n+i)-1) == 1 (mod prime(n+i)^2) for each i = 0..3, with k running over the positive integers; square array, read by antidiagonals, downwards.at n=22A319061
• a(n) = Sum_{k=0..n} (-1)^k * binomial(2*n+k-1,k) * binomial(4*n-k-1,n-k).at n=7A370103