Denominator of the sum of the reciprocals of the first n composite numbers.

Terms

a(0) =4a(1) =12a(2) =24a(3) =72a(4) =360a(5) =360a(6) =2520a(7) =504a(8) =1008a(9) =336a(10) =1680a(11) =1680a(12) =18480a(13) =18480a(14) =92400a(15) =1201200a(16) =10810800a(17) =10810800a(18) =10810800a(19) =21621600a(20) =21621600a(21) =367567200a(22) =52509600a(23) =52509600a(24) =997682400a(25) =997682400a(26) =997682400a(27) =6983776800a(28) =6983776800a(29) =6983776800