A 33-year-old worker at a logistics company's packaging shop in Hangzhou, Zhejiang province, made headlines when he shared his calculations about number patterns with mathematics PhD candidates at Zhejiang University recently.

The worker, Yu Jianchun, is from mountainous Xinxian county in Henan province. He graduated from a technology training school in Zhengzhou, Henan province.

Although he had little higher education and was a migrant worker after graduation, Yu maintains his interest in mathematics and spends almost all of his spare time studying it.