131394

Appears in sequences

• Numbers k such that 103*2^k+1 is prime.at n=19A032401
• Row sums of triangle A132071.at n=17A132072
• Numbers k such that 9*R_(k+2) - 2*10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=7A257040