53471161domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that p^2 divides 5^(p-1) - 1.at n=3A123692Primes p that satisfy q^(p-1) == 1 (mod p^2), i.e., are base-q Wieferich primes, for a prime q dividing p-1.at n=6A355545Prime numbersat n=3196529