Denominators of partial sums of reciprocals of lcm(1..n) = A003418(n).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =30a(5) =60a(6) =14a(7) =840a(8) =315a(9) =504a(10) =6930a(11) =9240a(12) =180180a(13) =360360a(14) =30030a(15) =720720a(16) =2042040a(17) =2450448a(18) =10581480a(19) =1989680a(20) =58198140a(21) =232792560a(22) =1338557220a(23) =254963280a(24) =13385572200a(25) =26771144400a(26) =5736673800a(27) =6177956400a(28) =291136195350