Primitive numbers k that divide sigma(k)*phi(k).

Terms

a(0) =6a(1) =28a(2) =40a(3) =117a(4) =135a(5) =496a(6) =775a(7) =891a(8) =1701a(9) =2176a(10) =5632a(11) =6875a(12) =8128a(13) =18688a(14) =23552a(15) =26624a(16) =44375a(17) =88723a(18) =89667a(19) =91136a(20) =274625a(21) =352256a(22) =557375a(23) =628849a(24) =722701a(25) =796797a(26) =1071875a(27) =1200663a(28) =1288625a(29) =1358127