208301

Appears in sequences

• Smallest base b such that there exist exactly n Wieferich primes (primes p satisfying b^(p-1) == 1 (mod p^2)) less than b.at n=10A255901
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 573", based on the 5-celled von Neumann neighborhood.at n=8A272996