As an aside: It shouldn't be too bad to write a "generator" for the geometric series, so that we can pick out the terms on-demand.
################################# >>> def geometric(base): ... x = 1 ... while True: ... yield x ... x *= base ... >>> twos = geometric(2) ################################# 'twos' is a representation of the geometric series; we can then pick out the elements one at a time: ################################# >>> twos.next() 1 >>> twos.next() 2 >>> twos.next() 4 >>> twos.next() 8 >>> twos.next() 16 >>> twos.next() 32 >>> twos.next() 64 #################################
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