195399

Appears in sequences

• G.f.: Sum_{n>=0} 2^n * x^n / (1-x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k]^2.at n=7A246538
• Numbers k such that (2*10^k + 529)/9 is prime.at n=30A281734