a(n) = the product of numbers k such that sigma(k) = sigma(n).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =66a(6) =7a(7) =8a(8) =9a(9) =170a(10) =66a(11) =12a(12) =13a(13) =4830a(14) =4830a(15) =400a(16) =170a(17) =18a(18) =19a(19) =21320a(20) =651a(21) =22a(22) =4830a(23) =53808a(24) =400a(25) =21320a(26) =27a(27) =1092a(28) =29a(29) =274833900