346140domain: NAppears in sequencesNumbers k such that 1*k + 1, 3*k + 1, 9*k + 1, 27*k + 1, 81*k + 1 are all primes.at n=18A112042One of the four successive approximations up to 13^n for 13-adic integer 3^(1/4). This is the 2 (mod 13) case (except for n = 0).at n=5A324077