Useless numbers: numbers written in English without any of the letters e, s or u.

Terms

a(0) =2a(1) =30a(2) =32a(3) =40a(4) =42a(5) =50a(6) =52a(7) =2000000a(8) =2000002a(9) =2000030a(10) =2000032a(11) =2000040a(12) =2000042a(13) =2000050a(14) =2000052a(15) =30000000a(16) =30000002a(17) =30000030a(18) =30000032a(19) =30000040a(20) =30000042a(21) =30000050a(22) =30000052a(23) =32000000a(24) =32000002a(25) =32000030a(26) =32000032a(27) =32000040a(28) =32000042a(29) =32000050