HP 25 Fibonacci sequence in one program step

[Joe Horn]

(10-13-2021 01:23 PM)rprosperi Wrote:  I don't recall what the answer is, but I do recall that Joe Horn showed me this at the PPC clubhouse around 1982. At the time it was with a 41C of course, but I believe he had figured this out on his HP-25, thus solving the author's challenge.

I predict he will reply here with the answer....

Yikes, really? No idea. I would have guessed that it would require 3 steps on a '25. I can't wait to see the solution!

EDIT: If the program is only required to succeed 3 times, then the program can be just ROLL DOWN, but that's silly.