Palindromes k such that 3k + 1 is also a palindrome.

Terms

a(0) =1a(1) =2a(2) =7a(3) =77a(4) =141a(5) =151a(6) =161a(7) =242a(8) =252a(9) =262a(10) =777a(11) =7777a(12) =14041a(13) =14141a(14) =14241a(15) =15051a(16) =15151a(17) =15251a(18) =16061a(19) =16161a(20) =16261a(21) =24042a(22) =24142a(23) =24242a(24) =25052a(25) =25152a(26) =25252a(27) =26062a(28) =26162a(29) =26262