53188

Appears in sequences

• Least i such that prime(i)*2^(10^n) - 1 is prime.at n=5A126716
• Smallest number that is the largest value in the Collatz (3x + 1) trajectories of exactly n initial values. (a(n)=0 if no such number exists.)at n=35A233293
• Largest even k such that h(-k) = 2n, where h(D) is the class number of the quadratic field with discriminant D; or 0 if no such k exists.at n=13A357573