191137domain: NPropertiesPrimalityPrimeyesAppears in sequencesEmirps using each of the digits 1, 3, 7, 9 at least once, but no others.at n=31A158917Primes n of the form 1000p+q with primes p and q, 998>p>q>100.at n=24A228268Prime numbersat n=17257