(n - phi(n)) | sigma(n) for composite n not congruent to 2 (mod 4).

Terms

a(0) =99a(1) =168a(2) =187a(3) =493a(4) =637a(5) =780a(6) =943a(7) =1273a(8) =1537a(9) =1836a(10) =2183a(11) =2225a(12) =2976a(13) =3103a(14) =3589a(15) =4183a(16) =5353a(17) =5928a(18) =6201a(19) =6468a(20) =6667a(21) =8881a(22) =9553a(23) =9727a(24) =13393a(25) =13888a(26) =14453a(27) =15397a(28) =17587a(29) =19897