"Lie Ryan" <lie.1...@gmail.com> wrote in message news:4c18a...@dnews.tpgi.com.au...
> Probably bending the rules a little bit:
>
>>>> sum(x**2 - 8*x - 20 for x in range(1, 2010, 5))
> 536926141
Or, letting Python do the algera for you:
>>> from sympy import var, sum
>>> dummy = var('j k')
>>> k = (5 * j) + 1
>>> t = (k)**2 + (k + 1)**2 + (k + 2)**2 - (k + 3)**2 - (k + 4)**2
>>> sum(t, (j, 0, 401))
536926141
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