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

Terms

a(0) =2a(1) =3a(2) =5a(3) =119a(4) =143a(5) =287a(6) =623a(7) =3983a(8) =6851a(9) =7429a(10) =13727a(11) =18601a(12) =37213a(13) =48209a(14) =118921a(15) =181559a(16) =322889a(17) =423181a(18) =891157a(19) =926041a(20) =961727a(21) =1115261a(22) =1150747a(23) =1656857a(24) =1693081a(25) =1799063a(26) =2219693a(27) =2303653a(28) =2325983a(29) =2350337