# SWISH NB: Natural Numbers (The Art of Prolog Chapter 3)

**URL:** <https://swi-prolog.discourse.group/t/swish-nb-natural-numbers-the-art-of-prolog-chapter-3/848>\
**Category:** Announce\
**Created:** [June 23, 2019, 12:30pm UTC](https://swi-prolog.discourse.group/t/swish-nb-natural-numbers-the-art-of-prolog-chapter-3/848 "2019-06-23T12:30:09Z")\
**Posts on this page:** 1\
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**Author:** ![PaulBrownMagic](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/paulbrownmagic/32/211_2.png) [@PaulBrownMagic](https://swi-prolog.discourse.group/u/PaulBrownMagic)\
**Post date:** [June 23, 2019, 12:30pm UTC](https://swi-prolog.discourse.group/t/swish-nb-natural-numbers-the-art-of-prolog-chapter-3/848/1 "2019-06-23T12:30:09Z")

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Hi all,  
If you’re working through The Art of Prolog or playing with recursion, you might like to mess about with the [SWISH notebook I put together going through the Natural Numbers](https://swish.swi-prolog.org/p/Natural%20Numbers.swinb). It’s not following the book exactly, I’ve left some room for you to play!