63479domain: NAppears in sequencesMonotonic ordering of set S generated by these rules: if x and y are in S and x^2-y^2>0 then x^2-y^2 is in S, and 2 and 3 are in S.at n=38A192648a(n) is the length of stage n in A137844.at n=15A291754Starts of runs of 3 consecutive factorial base Niven numbers (A118363).at n=22A328206