Numbers n such that n and 2n+1 are both palindromes.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =55a(6) =151a(7) =161a(8) =171a(9) =181a(10) =191a(11) =252a(12) =262a(13) =272a(14) =282a(15) =292a(16) =353a(17) =363a(18) =373a(19) =383a(20) =393a(21) =454a(22) =464a(23) =474a(24) =484a(25) =494a(26) =555a(27) =5555a(28) =15051a(29) =15151