Numbers k that divide sigma(k) * phi(k) and are not divisible by 6.

Terms

a(0) =1a(1) =28a(2) =40a(3) =117a(4) =135a(5) =196a(6) =200a(7) =224a(8) =496a(9) =640a(10) =775a(11) =819a(12) =891a(13) =1000a(14) =1372a(15) =1521a(16) =1550a(17) =1568a(18) =1701a(19) =1792a(20) =2176a(21) =2325a(22) =2480a(23) =3100a(24) =3159a(25) =3200a(26) =3375a(27) =3724a(28) =4455a(29) =5000