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

Terms

a(0) =312a(1) =560a(2) =588a(3) =1400a(4) =85632a(5) =147492a(6) =556160a(7) =569328a(8) =1590816a(9) =2013216a(10) =3343776a(11) =4695456a(12) =9745728a(13) =12558912a(14) =22013952a(15) =23336172a(16) =30002960a(17) =52021242a(18) =75007400a(19) =137617728a(20) =153587720a(21) =699117024a(22) =904683264a(23) =2468053248a(24) =2834395104a(25) =21669802880a(26) =48444151296