Numbers k such that sigma(x) = k has exactly 6 solutions.

Terms

a(0) =168a(1) =252a(2) =288a(3) =384a(4) =768a(5) =1248a(6) =1584a(7) =1860a(8) =2052a(9) =2480a(10) =2904a(11) =3906a(12) =3968a(13) =4116a(14) =4176a(15) =4224a(16) =4256a(17) =4284a(18) =4392a(19) =4416a(20) =4620a(21) =5824a(22) =5850a(23) =5856a(24) =5928a(25) =6084a(26) =6192a(27) =6216a(28) =6600a(29) =6636