Chinese Lucky Numbers – Numberphile

8 and 6 are lucky but 4 is unlucky… if you’re Chinese!

Featuring Xiaohui Yuan from the University of Nottingham.

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Videos by Brady Haran

Brady John Haran is an Australian independent film-maker and video journalist who is known for his educational videos and documentary films produced for BBC News and for his YouTube channels. (

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Featured book:

Number: The Language of Science

Number is an eloquent, accessible tour de force that reveals how the concept of number evolved from prehistoric times through the twentieth century. Tobias Dantzig shows that the development of math—from the invention of counting to the discovery of infinity—is a profoundly human story that progressed by “trying and erring, by groping and stumbling.” He shows how commerce, war, and religion led to advances in math, and he recounts the stories of individuals whose breakthroughs expanded the concept of number and created the mathematics that we know today.

– Rated 4.5/5 on Amazon

Math Joke from China


After class, Xiaogang asks Xiaodong what is the Math homework for today. Xiaodong replied, “The integer solutions of

\displaystyle \frac{x-2}{2}+3\geq x+1


are the question numbers of the Math Homework that are due.”

A Netizen posted: “If I had such a classmate, I would say, “Sorry I don’t know you, bye””
chinese math joke

(10 分)放学时,小刚问小东今天数学作业是哪儿题,小东回答说:“不等式组

\displaystyle \frac{x-2}{2}+3\geq x+1