Denominators of the difference between the squarefree totient analogs of the harmonic numbers and the harmonic numbers: F_n - H_n.

A138321

Denominators of the difference between the squarefree totient analogs of the harmonic numbers and the harmonic numbers: F_n - H_n.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =12a(4) =15a(5) =5a(6) =210a(7) =840a(8) =2520a(9) =2520a(10) =27720a(11) =27720a(12) =360360a(13) =360360a(14) =180180a(15) =720720a(16) =3063060a(17) =340340a(18) =58198140a(19) =29099070a(20) =58198140a(21) =58198140a(22) =1338557220a(23) =2677114440a(24) =13385572200a(25) =13385572200a(26) =40156716600a(27) =40156716600a(29) =582272390700

External references