242121643domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = 6*7^n+1.at n=9A199483Primes which divide a term of A073935.at n=21A286499Primes that divide some k dividing 4^k + 3^k (A045584).at n=8A354026Prime numbersat n=13271573