313031domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes formed from the concatenation of n, n-1 and n for some n > 0.at n=3A068659Primes of the form (p*(q-1) + (p-1)*q)/2, where p and q are consecutive odd primes.at n=18A099911Prime numbersat n=27037