Palindromes of the form 3n + 1 where n is also a palindrome: palindromes arising in A083829.

Terms

a(0) =4a(1) =7a(2) =22a(3) =232a(4) =424a(5) =454a(6) =484a(7) =727a(8) =757a(9) =787a(10) =2332a(11) =23332a(12) =42124a(13) =42424a(14) =42724a(15) =45154a(16) =45454a(17) =45754a(18) =48184a(19) =48484a(20) =48784a(21) =72127a(22) =72427a(23) =72727a(24) =75157a(25) =75457a(26) =75757a(27) =78187a(28) =78487a(29) =78787