TBF, if your goal is to generate the most valid sentence that directly answers the question, it's only one minor abstract noun that's broken here.

Edit: I wouldn't be surprised if there's a substantial drop in the probability of a digit being listed after the leading 9 (3.14159...), even, so it is "last" in a sense.

Edit again: Man, Baader-Meinhof so hard. Somehow pi to 5 digits came up more than once in 24 hours, so yes.