Turban numbers: without letters r, t, or u.

Terms

a(0) =1a(1) =5a(2) =6a(3) =7a(4) =9a(5) =11a(6) =1000000a(7) =1000001a(8) =1000005a(9) =1000006a(10) =1000007a(11) =1000009a(12) =1000011a(13) =5000000a(14) =5000001a(15) =5000005a(16) =5000006a(17) =5000007a(18) =5000009a(19) =5000011a(20) =6000000a(21) =6000001a(22) =6000005a(23) =6000006a(24) =6000007a(25) =6000009a(26) =6000011a(27) =7000000a(28) =7000001a(29) =7000005