This is a good fun puzzle I made up for my students. Thought people here would enjoy it.

enter image description here

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    $\begingroup$ the puzzle-creation tag is for asking about creating puzzles. If you just want to pose us a puzzle, use some tags that describe it. Also, do you have the original you printed that from? The picture is very hard to work with. $\endgroup$ – Kate Gregory Oct 17 '17 at 12:51
  • $\begingroup$ Perhaps / also should be added in the title. $\endgroup$ – Mea Culpa Nay Oct 17 '17 at 12:57
  • $\begingroup$ Matt. A better picture would go a long way too. For example cant tell if the very first signs at the top left are slashes or not $\endgroup$ – DEEM Oct 17 '17 at 13:06
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    $\begingroup$ That black background looks familiar. $\endgroup$ – Apep Oct 17 '17 at 13:15

This is semaphore. Using the flags you get the sentence asking what is the fifth Mersenne prime. A quick Google will tell you that the answer is therefore 8191 :)


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