Numbers n such that sigma(phi(n))/sigma(n) = 3.

Terms

a(0) =181a(1) =899a(2) =2501a(3) =4687a(4) =10991a(5) =12989a(6) =17653a(7) =25199a(8) =25853a(9) =26549a(10) =26657a(11) =54473a(12) =65941a(13) =68381a(14) =72007a(15) =82777a(16) =96197a(17) =98903a(18) =102719a(19) =116449a(20) =124013a(21) =135907a(22) =150121a(23) =169153a(24) =188917a(25) =193553a(26) =201173a(27) =207461a(28) =219559a(29) =234301