Numbers k such that sigma(x) = k has exactly 7 solutions.

Terms

a(0) =240a(1) =684a(2) =744a(3) =912a(4) =1092a(5) =1176a(6) =1200a(7) =1368a(8) =1596a(9) =2340a(10) =2376a(11) =2496a(12) =2700a(13) =3072a(14) =3348a(15) =4212a(16) =5460a(17) =5520a(18) =5586a(19) =5642a(20) =5712a(21) =6000a(22) =6160a(23) =6264a(24) =6804a(25) =6864a(26) =7068a(27) =7254a(28) =7584a(29) =7632