Numerator of the harmonic mean of the first n composite numbers.

Terms

a(0) =4a(1) =24a(2) =72a(3) =288a(4) =1800a(5) =2160a(6) =17640a(7) =4032a(8) =9072a(9) =3360a(10) =18480a(11) =20160a(12) =240240a(13) =258720a(14) =1386000a(15) =19219200a(16) =183783600a(17) =194594400a(18) =205405200a(19) =432432000a(20) =454053600a(21) =8086478400a(22) =1207720800a(23) =1260230400a(24) =24942060000a(25) =25939742400a(26) =26937424800a(27) =195545750400a(28) =202529527200