In [21]: s = summation(k**(-2.1), (k, 1, oo))
In [23]: %timeit s.evalf()
1 loops, best of 3: 196 ms per loop
In [24]: s = summation(k**(-x), (k, 1, oo))
In [26]: %timeit s.evalf(subs={x : 2.1})
still calculating
This seems like a bug?
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