121782domain: NAppears in sequencesLeast integer b > F(n) such that sum_{k=1}^n F(k)*b^{k-1} is prime, where F = A000045.at n=24A224487Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 2 3 4 6 or 7.at n=7A252273