Denominators of the partial sums of the reciprocals of the Dedekind psi function (A001615).

Terms

a(0) =1a(1) =3a(2) =12a(3) =4a(4) =12a(5) =1a(6) =8a(7) =24a(8) =24a(9) =72a(10) =72a(11) =36a(12) =252a(13) =504a(14) =126a(15) =504a(16) =504a(17) =504a(18) =2520a(19) =840a(20) =3360a(21) =10080a(22) =10080a(23) =10080a(24) =2016a(25) =2016a(26) =2016a(27) =2016a(28) =10080a(29) =10080