Numbers k such that sigma(x) = k has exactly 3 solutions.

Terms

a(0) =24a(1) =42a(2) =48a(3) =60a(4) =84a(5) =90a(6) =224a(7) =228a(8) =234a(9) =248a(10) =270a(11) =294a(12) =324a(13) =450a(14) =468a(15) =528a(16) =558a(17) =620a(18) =640a(19) =660a(20) =810a(21) =882a(22) =888a(23) =896a(24) =968a(25) =972a(26) =1020a(27) =1050a(28) =1104a(29) =1116