481691513domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes followed by a gap of 200 = nextprime(p) - p.at n=2A204807Smaller of two consecutive primes p and q, both ending with 3, such that q-p = 10n, or -1 if no such primes exist.at n=19A381372Prime numbersat n=25441017