Numbers n such that sigma(n+1) = n + phi(n).

Terms

a(0) =4a(1) =6a(2) =32a(3) =38a(4) =54a(5) =56a(6) =84a(7) =278a(8) =2664a(9) =10944a(10) =15608a(11) =20720a(12) =84800a(13) =179576a(14) =209664a(15) =6251904a(16) =85505600a(17) =125226624a(18) =584003328a(19) =19018936320a(20) =20534891040a(21) =79185129984a(22) =87065548800a(23) =191904215040a(24) =964494300024