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2011-05-15 13:22:11 +0200 received badge  Supporter (source)
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2011-05-15 11:55:37 +0200 answered a question How-to: sum

I met a similar problem. Take the following example.

K.<a> = GF(8, 'a')
for k in K:
    print sum(k^(2^i),i,0,3)

which prints:

Traceback (click to the left of this block for traceback)
TypeError: unable to convert x (=i) to an integer

Let us try another syntax.

K.<a> = GF(8, 'a')
for k in K:
    sum([k^(2^i) for i in [0..3]])

Now it is okay thanks to the previous answer. I wonder if it's possible to make it work with the first syntax.