ifactor problem with new update

[DMaier]

By the way:

ifactor(2^101+5)=47*1721*253719757*123536856746739823 (this fails)

ifactor(2^102+5)=3*85060127*19870659260881492319689

ifactor(2^128+1)=59649589127497217*5704689200685129054721



It doesn't fail with either:

ifactor(47*1721*253719757)

or

ifactor(47*1721*123536856746739823)

but the following does fail:

ifactor(253719757*123536856746739823)