5764793domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = 7^n - n.at n=8A024076Primes of the form k^8-k-1.at n=1A126437Primes of the form 7^n - n.at n=2A224468Prime numbers of the form 7^k - 8.at n=2A291860Prime numbersat n=397763