Numbers with exactly three distinct base-10 digits.

Terms

a(0) =102a(1) =103a(2) =104a(3) =105a(4) =106a(5) =107a(6) =108a(7) =109a(8) =120a(9) =123a(10) =124a(11) =125a(12) =126a(13) =127a(14) =128a(15) =129a(16) =130a(17) =132a(18) =134a(19) =135a(20) =136a(21) =137a(22) =138a(23) =139a(24) =140a(25) =142a(26) =143a(27) =145a(28) =146a(29) =147