431311domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes > 1000 in which every substring of lengths 2 and 3 are also prime.at n=21A069490Primes n of the form 10000p+100q+r with primes p, q and r, 98>p>q>r>10.at n=16A168500Prime numbersat n=36264