Proof Sketch: Transform the continued fraction into a hypergeometric series Apply Clausen's identity for hypergeometric transformations Recognize the series as a Ramanujan-type series for 1/Ï€ Use ...
That proof has exactly one thing it must be handed per chain length: that a seed exists on the (1,2) block at all, at each odd N. This note is about that one input. Until now it was supplied by a ...