263720

Appears in sequences

• Numbers k such that 4*10^k + 6*R_k - 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=35A099005
• Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum 1 and no antidiagonal sum 2 and no row sum 0 and no column sum 3.at n=36A255793
• Expansion of ((1 + 4*x)/(1 - 4*x))^(1/4).at n=11A303537