Numbers k such that tau(k) = sigma(sopf(k)).

Terms

a(0) =4a(1) =12a(2) =18a(3) =27a(4) =40a(5) =180a(6) =250a(7) =300a(8) =450a(9) =704a(10) =780a(11) =924a(12) =1120a(13) =1170a(14) =1320a(15) =1344a(16) =1386a(17) =1400a(18) =1950a(19) =1960a(20) =2025a(21) =2970a(22) =3125a(23) =3192a(24) =3234a(25) =3500a(26) =4080a(27) =4455a(28) =4725a(29) =4760