Numbers n such that sigma(n) = 4*(n-phi(n)).

Terms

a(0) =3a(1) =99a(2) =168a(3) =780a(4) =1836a(5) =2976a(6) =5928a(7) =6201a(8) =6468a(9) =13888a(10) =48768a(11) =75696a(12) =123216a(13) =227584a(14) =285948a(15) =401952a(16) =437664a(17) =1003000a(18) =2058732a(19) =3302592a(20) =3810624a(21) =4031488a(22) =4258496a(23) =4318656a(24) =6713664a(25) =14188992a(26) =32021613a(27) =93298284a(28) =201302016a(29) =226196736