Numbers k such that k divides phi(k) * sigma(k).

Terms

a(0) =1a(1) =6a(2) =18a(3) =24a(4) =28a(5) =40a(6) =54a(7) =72a(8) =84a(9) =96a(10) =117a(11) =120a(12) =135a(13) =162a(14) =196a(15) =200a(16) =216a(17) =224a(18) =234a(19) =252a(20) =270a(21) =288a(22) =360a(23) =384a(24) =468a(25) =486a(26) =496a(27) =540a(28) =588a(29) =600