Denominators of the partial sums of the reciprocals of the sum of bi-unitary divisors function (A188999).

A379616

Denominators of the partial sums of the reciprocals of the sum of bi-unitary divisors function (A188999).

Terms

    a(0) =1a(1) =3a(2) =12a(3) =60a(4) =20a(5) =30a(6) =120a(7) =40a(8) =40a(9) =360a(10) =360a(11) =72a(12) =504a(13) =126a(14) =504a(15) =1512a(16) =1512a(17) =7560a(18) =1512a(19) =7560a(20) =30240a(21) =30240a(22) =30240a(23) =30240a(24) =393120a(25) =393120a(26) =393120a(27) =393120a(28) =393120a(29) =393120

External references