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# Weekly Challenges

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Want to get involved? We're always looking for ideas and content for Weekly Challenges.

## Challenge #241: Friday the 13th

Alteryx

A solution to last week's challenge can be found hereSource: https://en.wikipedia.org/wiki/Goaltender_mask

This Friday will be another Friday the 13th. Whether or not you consider yourself to be superstitious, odds are you're familiar with this dreaded calendar configuration.

But just how common are these occurrences? For this week's challenge, construct a workflow that provides a count of the number of Friday the 13ths for each year since 1900.

Bonus: Are there any years that don't have a Friday the 13th?

11 - Bolide

Spooky challenge!

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17 - Castor
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And for the bonus, I think we can prove that there will always be a Friday the 13th. We can ignore January and February due to leap year weirdness, and just prove that regardless of what day March the 13th will fall on, there will be a friday the 13th at some point in March-December. Here are the months:

11 - Bolide
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I always need to check the date formats (https://help.alteryx.com/current/designer/datetime-functions) should bookmark it...

12 - Quasar

Nice quick one this week!

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Video solution below

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9 - Comet
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Quick, fun challenge, meaning the associated video is also nice and short: https://www.youtube.com/watch?v=Tu587UuaMt0&list=PL18SpOXDj-KMUD4YwWC5vZaUsIa7drxNZ&index=45

Find the challenge here: https://community.alteryx.com/t5/Weekly-Challenge/Challenge-241-Friday-the-13th/td-p/663110
17 - Castor

My solution.

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9 - Comet

There's no escape...

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16 - Nebula

Nice quick challenge for this week!

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16 - Nebula

Solution attached. 🙂

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