Denominator of 1/3 + 1/7 + 1/11 + ... + 1/(4n-1).

A074638

Denominator of 1/3 + 1/7 + 1/11 + ... + 1/(4n-1).

Terms

    a(0) =3a(1) =21a(2) =231a(3) =385a(4) =7315a(5) =168245a(6) =4542615a(7) =140821065a(8) =28164213a(9) =366134769a(10) =15743795067a(11) =739958368149

External references