I don't know if this answers your question, but the first place that I would look would be Wikipedia. There is a page of recreational mathematics. I would focus on the authors on that page, but there is also a page underneath that one, "Category: recreational mathematicians," which may be an even better place to start from scratch.

I don't know if this answers your question, but the first place that I would look would be Wikipedia. There is a page of recreational mathematics. I would focus on the authors on that page, but there is also a page underneath that one, "Category: recreational mathematicians," which may be an even better place to start from scratch.

In fact, the Wikipedia article does mention three journals that give recreational mathematics problems: Eureka, The Journal of Recreational Mathematics (which stopped publishing in 2014), and Recreational Mathematics Magazine.