208961domain: NPropertiesPrimalityPrimeyesAppears in sequencesFibonacci sequence beginning 5, 16.at n=21A022140Primes p such that p+2, n*(p+2)+6 and p*(p+2)+8 are also prime.at n=31A130735Primes p with p-1, p+1, prime(p)-1 and prime(p)+1 all practical.at n=26A257924Prime numbersat n=18715