Numbers n such that sigma(n)/tau(n) is a perfect number.

Terms

a(0) =11a(1) =14a(2) =15a(3) =91a(4) =92a(5) =132a(6) =140a(7) =991a(8) =1891a(9) =3525a(10) =3792a(11) =4025a(12) =4650a(13) =5775a(14) =6384a(15) =45847a(16) =78337a(17) =99904a(18) =105664a(19) =180544a(20) =133152769a(21) =134176771a(22) =227512999a(23) =233016679a(24) =451443979a(25) =865079296a(26) =1478127616a(27) =1509765120a(28) =1585188864a(29) =1660973056