129473domain: NAppears in sequencesSmallest base b such that there exist exactly n Wieferich pseudoprimes (composites c satisfying b^(c-1) == 1 (mod c^2)) less than b.at n=17A255885Bases b where exactly nine primes p with p < b exist such that p is a base-b Wieferich prime.at n=22A325885