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

A379520

Denominators of the partial alternating 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) =12a(7) =84a(8) =168a(9) =168a(10) =840a(11) =840a(12) =280a(13) =840a(14) =105a(15) =105a(16) =1680a(17) =1680a(18) =5040a(19) =5040a(20) =5040a(21) =5040a(22) =55440a(23) =55440a(24) =55440a(25) =55440a(26) =720720a(27) =80080a(28) =80080a(29) =80080

External references