Numbers k such that phi(k)^phi(k) == 1 (mod sigma(k)).

Terms

a(0) =1a(1) =2a(2) =8a(3) =36a(4) =128a(5) =225a(6) =289a(7) =578a(8) =900a(9) =2025a(10) =2601a(11) =3600a(12) =10404a(13) =32768a(14) =41616a(15) =45369a(16) =57600a(17) =242064a(18) =665856a(19) =725904a(20) =783225a(21) =1134225a(22) =1140624a(23) =1782225a(24) =1988100a(25) =2903616a(26) =3132900a(27) =4862025a(28) =6155361a(29) =6275025