11333131domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes consisting only of digits 1 and 3 occurring with equal frequency.at n=3A087511Primes consisting of two digits only, each digit with frequency f = 4.at n=4A173002Emirps containing only the digits 1 and 3.at n=23A335787Prime numbersat n=747042