225457domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that p*(p-2) divides 2^(p-1)-1.at n=25A081762Primes p such that p*(p-2) divides 3^(p-1)-1.at n=19A081764Numbers n such that (n-1)^2-1 divides 2^(n-1)-1.at n=26A260406Odd integers k such that 3^((k-1)/2) == 1 (mod k*(k-2)).at n=9A337847Prime numbersat n=20058