66485domain: NAppears in sequencesNumbers whose base-3 representation has exactly 11 runs.at n=13A043591Numbers n such that number of runs in the base 3 representation of n is congruent to 1 mod 10.at n=33A043816Numbers k such that 5*10^k + 4*R_k - 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=18A103013