105657

Appears in sequences

• Bases b where exactly nine primes p with p < b exist such that p is a base-b Wieferich prime.at n=17A325885
• a(n) is the largest integer k such that sigma(k)/(d(k)*sopf(k)) = n where d=A000005, sigma=A000203 and sopf=A008472.at n=19A328175