Problems & Puzzles: Puzzles Puzzle 238. The hidden prime This last two weeks our family started trying to solve some puzzles not of numerical nature but of the so called 'lateral thinking' type (in order to get used to think 'out of the box'). One of these puzzles (by Lloyd King) suggested to me a parallel prime puzzle. I hope none of you get angry with me for posting this, maybe very simple, puzzle:
Solution:
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