HP 25 Fibonacci sequence in one program step

10132021, 01:03 PM
Post: #1




HP 25 Fibonacci sequence in one program step
I've been reading "Mathematical Recreations for the Programmable Calculator", and they have a somewhat humorous puzzle regarding the shortest possible program to produce the Fibonacci sequence.
The HP 25 program they concocted is only a single step, plus the typical GTO 00 to halt and reset the program. This short program does require the user to preload the stack and/or memory prior to running, but then subsequent presses of R/S produce the Fibonacci sequence on the display. I'm curious if anybody can figure out the silly trick that they used in this book. 

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