Numbers that contain a 2.

Terms

a(0) =2a(1) =12a(2) =20a(3) =21a(4) =22a(5) =23a(6) =24a(7) =25a(8) =26a(9) =27a(10) =28a(11) =29a(12) =32a(13) =42a(14) =52a(15) =62a(16) =72a(17) =82a(18) =92a(19) =102a(20) =112a(21) =120a(22) =121a(23) =122a(24) =123a(25) =124a(26) =125a(27) =126a(28) =127a(29) =128