This holiday season my brief indulgence was solving the Advent of Code puzzles. One was about the look-and-say sequence. It starts with "1" and grows as follows: 1 is read off as "one 1" or 11. 11 is read off as "two 1s" or 21. 21 is read off as "one 2, then one 1" … Continue reading Look-and-say: F# →