2259801991domain: NAppears in sequencesPrimes of the form 2^r*7^s - 1.at n=28A077314Smallest prime of the form k^n + k^(n-1) - 1.at n=10A126017a(n) = 8*7^n-1.at n=10A198689Primes of the form m = 7^i + 7^j - 1, where i > j >= 0.at n=12A239717