775777domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that contain digits 5 and 7 only.at n=18A020467Near-repdigit primes with 7 as repeated digit.at n=33A105977Prime numbers consisting of only odd digits such that there is only one permutation of its digits that produces a prime number.at n=26A225421Prime numbersat n=62156