203025

Appears in sequences

• a(n) = number of primes of the form x^2 + 1 <= 2^n.at n=43A083847
• Number of primes of the form x^2 + 1 < 2^n.at n=43A174246
• Number of nX3 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.at n=6A283629
• T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.at n=42A283634
• Number of 7Xn 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.at n=2A283640