I found on http://www.prothsearch.net/fermat.html that 84977118993*2^
{520} + 1 | 2^{2^517}+1. Can this result be verified by Sage?

sage: mod(2^(2^517)+1,84977118993*2^520+1)
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call
last)

/home/jaakko/Matikka/sage-4.2.1-linux-Ubuntu_9.10-i686-Linux/<ipython
console> in <module>()

/home/jaakko/Matikka/sage-4.2.1-linux-Ubuntu_9.10-i686-Linux/local/lib/
python2.6/site-packages/sage/rings/integer.so in
sage.rings.integer.Integer.__pow__ (sage/rings/integer.c:12061)()

RuntimeError: exponent must be at most 2147483647

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