313810596091domain: NAppears in sequencesPrimes of the form 10*3^k + 1.at n=8A068715Smallest prime larger than 3^n whose digits begin with those of 3^n.at n=22A068841a(n) = 10*3^n+1.at n=22A199112a(n) = 10*9^n+1.at n=11A199678