Numbers whose American English name contains the letter 'f'.

Terms

a(0) =4a(1) =5a(2) =14a(3) =15a(4) =24a(5) =25a(6) =34a(7) =35a(8) =40a(9) =41a(10) =42a(11) =43a(12) =44a(13) =45a(14) =46a(15) =47a(16) =48a(17) =49a(18) =50a(19) =51a(20) =52a(21) =53a(22) =54a(23) =55a(24) =56a(25) =57a(26) =58a(27) =59a(28) =64a(29) =65