Suburban numbers: without b, r, s or u.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =9a(5) =10a(6) =11a(7) =12a(8) =15a(9) =18a(10) =19a(11) =20a(12) =21a(13) =22a(14) =25a(15) =28a(16) =29a(17) =50a(18) =51a(19) =52a(20) =55a(21) =58a(22) =59a(23) =80a(24) =81a(25) =82a(26) =85a(27) =88a(28) =89a(29) =90