Numbers that do not contain the letter 't'.

Terms

a(0) =0a(1) =1a(2) =4a(3) =5a(4) =6a(5) =7a(6) =9a(7) =11a(8) =100a(9) =101a(10) =104a(11) =105a(12) =106a(13) =107a(14) =109a(15) =111a(16) =400a(17) =401a(18) =404a(19) =405a(20) =406a(21) =407a(22) =409a(23) =411a(24) =500a(25) =501a(26) =504a(27) =505a(28) =506a(29) =507