I have no idea if the following is related, but thought I'd post it
here rather than support in case it is:

----------------------------------------------------------------------
| Sage Version 3.3.alpha5, Release Date: 2009-02-03                  |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
sage: f(n)=n^2+n+41
sage: f(39),is_prime(f(39)),factor(f(39))
(1601, True, 1601)
sage: f(40),is_prime(f(40)),factor(f(40))
(1681, False, 1681)
sage: factor(1681)
41^2

I think I would consider this a bug; even if I shouldn't put a
symbolic thing in factor, it should give an error rather than refuse
to factor.

- kcrisman
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