Hallo,
I'm wondering what goes  wrong with tis:

(sage 3.2 compiled from sources, ubuntu 8.04, quad core 2.4 GHz)


sage: for k in range(14,21):
....:     f=2^2^k+1;w=ecm.find_factor(f);[w[0],prod(w)==f]
....:
[2, False]
[523923, False]
[1901173, False]
[2, False]
[2, False]
[30539, False]
[2, False]

Are the exponents to big?

Andrzej Chrzeszczyk
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