124956059domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes followed by a gap of 170 = nextprime(p)-p.at n=9A204805Smaller of two consecutive primes p and q, both ending with 9, such that q - p = 10*n, or -1 if no such primes exist.at n=16A381511Prime numbersat n=7107787