Numbers n for which there is a unique k such that n = k + reverse(k).

Terms

a(0) =0a(1) =2a(2) =4a(3) =6a(4) =8a(5) =10a(6) =11a(7) =12a(8) =14a(9) =16a(10) =18a(11) =101a(12) =141a(13) =161a(14) =181a(15) =198a(16) =201a(17) =221a(18) =241a(19) =261a(20) =281a(21) =1001a(22) =1818a(23) =1838a(24) =1858a(25) =1878a(26) =1898a(27) =1918a(28) =1938a(29) =1958