81778

Appears in sequences

• Integers k such that 10^k+39 is a prime number.at n=16A135108
• Convolution square of A000219.at n=14A161870
• a(n) = Sum_{k=0..floor(n/2)} binomial(n-k,k) * binomial(2*(n-2*k),n-2*k).at n=9A383573