Numbers n such that phi(phi(n)) + sigma(sigma(n)) - phi(sigma(n)) - sigma(phi(n)) = sigma(n).

Terms

a(0) =827a(1) =975a(2) =1607a(3) =13149a(4) =20919a(5) =34921a(6) =58649a(7) =202223a(8) =347869a(9) =545377a(10) =900521a(11) =1451135a(12) =2288845a(13) =2453509a(14) =2804855a(15) =3063031a(16) =4134579a(17) =11320177a(18) =11446955a(19) =14573651a(20) =16477307a(21) =17678225a(22) =25164429a(23) =27514643a(24) =28475077a(25) =47443799a(26) =49348333a(27) =50971501a(28) =53108173a(29) =66213757