840743domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes which can be expressed as sum of distinct powers of 7.at n=8A0777211+n^2+n^3+n^5+n^7; 10101101 in base n.at n=6A123111Primes whose base-7 representation also is the base-2 representation of a prime.at n=6A235464Prime numbersat n=66940