529811591domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes followed by a gap of 200 = nextprime(p) - p.at n=4A204807Smallest 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=19A380785Prime numbersat n=27841352