# Replacement puzzle

**URL:** <https://boards.straightdope.com/t/replacement-puzzle/74156>\
**Category:** Miscellaneous and Personal Stuff I Must Share\
**Created:** [July 29, 2001, 2:03pm UTC](https://boards.straightdope.com/t/replacement-puzzle/74156 "2001-07-29T14:03:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![McMurphy](https://avatars.discourse-cdn.com/v4/letter/m/e19adc/32.png) [@McMurphy](https://boards.straightdope.com/u/McMurphy)\
**Post date:** [July 29, 2001, 2:03pm UTC](https://boards.straightdope.com/t/replacement-puzzle/74156/1 "2001-07-29T14:03:01Z")

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Since there doesn’t seem to be an official sunday morning puzzle today here’s an inferior replacement. Simply create a magic square (a square of numbers where all the rows, columns and diagonals all add up to the same number) made entirely out of prime numbers less than 100. I’ll even be generous and let you use 1 as a prime number even though it isn’t technically.

I’ve been working on this for a couple of hours and haven’t gotten anywhere, see if you can beat me to it.

> [@](#):
>
> _Example Magic Square_
> 
> 2 7 6  
> 9 5 1  
> 4 3 8

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<div class="post-metadata">

**Author:** ![McMurphy](https://avatars.discourse-cdn.com/v4/letter/m/e19adc/32.png) [@McMurphy](https://boards.straightdope.com/u/McMurphy)\
**Post date:** [July 29, 2001, 2:12pm UTC](https://boards.straightdope.com/t/replacement-puzzle/74156/2 "2001-07-29T14:12:50Z")

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For ease, here is a complete list of numbers you are allowed to use

\*\*1 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 \*\*