Values of n where (phi(n) * sigma(n))/n is an integer and increases.

Terms

a(0) =1a(1) =6a(2) =18a(3) =24a(4) =28a(5) =40a(6) =54a(7) =72a(8) =96a(9) =117a(10) =135a(11) =196a(12) =200a(13) =216a(14) =224a(15) =288a(16) =360a(17) =384a(18) =468a(19) =496a(20) =600a(21) =640a(22) =756a(23) =775a(24) =864a(25) =891a(26) =1000a(27) =1080a(28) =1152a(29) =1372