84549821domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes followed by a gap of 170 = nextprime(p)-p.at n=3A204805Smallest of two consecutive primes p and q, both ending with 1, such that q - p = 10n, or -1 if no such primes exist.at n=16A380785Prime numbersat n=4919150