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Paper qualifications are not everything, as shown by a worker in China.
33-year-old worker Yu Jianchun does have a degree, but has made the news for solving problems even mathematicians have trouble with.
According to CCTV News, Yu came up with an alternative method to verify Carmichael numbers.
Carmichael numbers are “pseudo primes” that are hard to be determined as prime numbers, which are divisible only by one and itself. There are 255 positive integers smaller than 100 million that qualify as Carmichael numbers.
Yu's method has caught the attention of a math professor from Zhejiang University, who plans to include the 33-year-old workers problem-solving methods in his text books.