Oh, I almost forgot: for the 100T digits, the primary algorithm they used actually computes \frac{1}{\pi}, not \pi itself. They did a final reciprocal to get pi. That would definitely count as arithmetic performed on \frac{1}{\pi}.
Oh, I almost forgot: for the 100T digits, the primary algorithm they used actually computes \frac{1}{\pi}, not \pi itself. They did a final reciprocal to get pi. That would definitely count as arithmetic performed on \frac{1}{\pi}.