a(n) = (n in base 10) * (n in base 2).

Terms

a(0) =0a(1) =1a(2) =20a(3) =33a(4) =400a(5) =505a(6) =660a(7) =777a(8) =8000a(9) =9009a(10) =10100a(11) =11121a(12) =13200a(13) =14313a(14) =15540a(15) =16665a(16) =160000a(17) =170017a(18) =180180a(19) =190209a(20) =202000a(21) =212121a(22) =222420a(23) =232553a(24) =264000a(25) =275025a(26) =286260a(27) =297297a(28) =310800a(29) =321929