问HN：休闲数学书籍推荐
我想开始把数学作为一种爱好进行学习和探索。在大学时我学过工程数学，也喜欢发现有趣的计算机科学算法。希望能找到一些有趣且引人入胜的书籍，内容不需要太复杂的思考。
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I want to start studying and exploring math for a hobby. I had Engineering mathematics during University days, and also enjoy discovering interesting computer science algorithms. Looking for interesting, engaging books that don't require toooo much thinking.