7909306973domain: NAppears in sequencesPrimes of the form 2^r*7^s + 1.at n=28A077498a(n) is the smallest prime p such that 7^n divides p^6 - 1.at n=10A125611Smallest odd prime base q such that p^11 divides q^(p-1) - 1, where p = prime(n).at n=3A133861a(n) = 4*7^n+1.at n=11A199419