Denominator of f(n) := Product_{i=1..n} sigma(i)/i.

Terms

a(0) =1a(1) =2a(2) =1a(3) =2a(4) =5a(5) =5a(6) =5a(7) =1a(8) =1a(9) =5a(10) =55a(11) =55a(12) =55a(13) =55a(14) =275a(15) =275a(16) =4675a(17) =4675a(18) =17765a(19) =88825a(20) =88825a(21) =977075a(22) =22472725a(23) =4494545a(24) =112363625a(25) =112363625a(26) =22472725a(27) =22472725a(28) =130341805a(29) =651709025