69942domain: NAppears in sequencesNumbers whose base-4 representation has exactly 9 runs.at n=22A043600Numbers n such that number of runs in the base 4 representation of n is congruent to 0 mod 9.at n=22A043858Numbers k such that number of runs in the base 4 representation of k is congruent to 9 mod 10.at n=22A043876