On 16/12/2010 4:55 p.m., William Rex Marshall wrote: > a(n) = > ((p-1) * A104017(n)^2) / ((q-1) * (r-1) * ... * (t-1)). Typo correction: That should have been written a(n) = ((p-1) * (A104017(n)-1)^2) / ((q-1) * (r-1) * ... * (t-1)).