Numbers k such that sigma(k)*phi(k) is a palindrome.

Terms

a(0) =1a(1) =2a(2) =3a(3) =69a(4) =219a(5) =221a(6) =224a(7) =254a(8) =1772a(9) =2181a(10) =15463a(11) =50807a(12) =63551a(13) =94236a(14) =161257a(15) =602962a(16) =2105689a(17) =8371756a(18) =2115856505a(19) =2539027806a(20) =5472276593a(21) =6819131191a(22) =15442198064a(23) =16190055003a(24) =46870943027