99143

Appears in sequences

• Numbers k such that 5*10^k + R_k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=16A056713
• Number of zero-sum -6..6 arrays of n elements with first and second differences also in -6..6.at n=6A201871
• Number of zero-sum -n..n arrays of 7 elements with first and second differences also in -n..n.at n=5A201878