194586

Appears in sequences

• Number of integers <= 2^n of form 4 x^2 + 4 x y + 5 y^2.at n=21A000076
• Initial seeds x which will enter a cycle of length 4 under the iteration of x -> A063919(x), the sum of proper unitary divisors.at n=9A098187
• Number of (n+1)X(2+1) 0..3 arrays with every 2X2 subblock summing to a prime.at n=2A251453
• Number of (n+1) X (3+1) 0..3 arrays with every 2 X 2 subblock summing to a prime.at n=1A251454
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock summing to a prime.at n=7A251459
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock summing to a prime.at n=8A251459