SymPy Gamma

Input:

summation(1/2**i%2C%20(i%2C%200%2C%20oo))

Error:

summation(1/2**i%2C%20(i%2C%200%2C%20oo))

specify dummy variables for oo*Mod(C*Mod(2**(-i), 2), 20)*Mod(C*Mod(C*i, 2), 20)

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