51889

Appears in sequences

• Numbers n such that 8*10^n + R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=11A103071
• a(0)=1, a(1)=0, a(2)=1, a(n) = a(n-1) + a(n-2) + 3*a(n-3).at n=16A123102
• Numbers k such that (94*10^k + 11)/3 is prime.at n=22A280019
• Numbers k such that k divides 2^(2k+1) + 1.at n=4A319222