Numbers k not congruent to 0 (mod 3) such that phi(k) + 4 | sigma(k).

Terms

a(0) =175a(1) =220a(2) =350a(3) =752a(4) =3772a(5) =4720a(6) =5092a(7) =15296a(8) =80320a(9) =269872a(10) =632752a(11) =807650a(12) =1126672a(13) =1304320a(14) =4176896a(15) =4386476a(16) =20945920a(17) =37030556a(18) =1073463296a(19) =17178755072a(20) =34796530432a(21) =85897707520a(22) =274873450496