Numbers that do not contain the letter `f'.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =6a(5) =7a(6) =8a(7) =9a(8) =10a(9) =11a(10) =12a(11) =13a(12) =16a(13) =17a(14) =18a(15) =19a(16) =20a(17) =21a(18) =22a(19) =23a(20) =26a(21) =27a(22) =28a(23) =29a(24) =30a(25) =31a(26) =32a(27) =33a(28) =36a(29) =37