Denominators of the partial sums of the reciprocals of the unitary totient function (A047994).

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =12a(5) =12a(6) =4a(7) =28a(8) =56a(9) =56a(10) =280a(11) =840a(12) =280a(13) =840a(14) =210a(15) =42a(16) =336a(17) =336a(18) =1008a(19) =1008a(20) =1008a(21) =5040a(22) =55440a(23) =55440a(24) =55440a(25) =55440a(26) =720720a(27) =720720a(28) =102960a(29) =102960