248831domain: NAppears in sequencesa(n) = 12^n - 1.at n=5A024140Numbers whose set of base 12 digits is {0,B}, where B base 12 = 11 base 10.at n=31A097258Semiprimes which are sub-perfect powers.at n=36A189045a(n) = n^5 - 1.at n=11A258807