Palindromes 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) =11a(6) =101a(7) =141a(8) =161a(9) =181a(10) =1001a(11) =10001a(12) =10201a(13) =10401a(14) =10601a(15) =10801a(16) =100001a(17) =1000001a(18) =1002001a(19) =1004001a(20) =1006001a(21) =1008001a(22) =10000001a(23) =100000001a(24) =100020001a(25) =100040001a(26) =100060001a(27) =100080001a(28) =1000000001a(29) =10000000001