Palindromes whose sum of divisors is palindromic.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =333a(7) =17571a(8) =1757571a(9) =1787871a(10) =2249422a(11) =4369634a(12) =5136315a(13) =412727214a(14) =439838934a(15) =518686815a(16) =541626145a(17) =17575757571a(18) =52554845525