160149

Appears in sequences

• Concatenations C1 and C2 and C3 are all prime (see the comment lines).at n=30A034817
• a(n) = binomial(3*n,n)/(2*n + 1) - 2*binomial(3*(n - 1),n - 1)/(2*n - 1) for n > 0 with a(0) = 1.at n=9A336945