At the expense of not being very interesting. Beginning with term 22, I think term 2*n will be 7*10^(n-8) and term 2*n+1, 9*10^(n-8). > On May 7, 2015, at 7:44 PM, Eric Angelini <Eric.Angelini at kntv.be> wrote: > > ... I think that the seq will never stop if we want it to be monotonically increasing: a(n)>a(n-1).