Numbers k such that sigma(k) and phi(k) are both palindromes.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =2881a(7) =15456a(8) =20930a(9) =26461a(10) =26772a(11) =43262a(12) =135536a(13) =271171a(14) =2118161a(15) =2362081a(16) =2545951a(17) =2779321a(18) =4236322a(19) =6354483a(20) =12936656a(21) =28666681a(22) =221782512a(23) =253676851a(24) =259202401a(25) =259828451a(26) =276025121a(27) =276949721a(28) =437593059a(29) =472911836