A migrant worker who works as a mailman in China has found a simple way to solve complex math problems, just like Matt Damon’s character from Good Will Hunting — and it’s earn him a job offer from a private investment group.

Yu Jianchun discovered new a way to find Carmichaels, also known as “pseudoprimes,” which are large numbers that appear to be prime, but in fact are not. He has no college degree or formal advanced mathematics training, but relies mostly on his intuition to solve the problems, he said.

“I made my discoveries through intuition,” Yu said in an interview with China Daily. “I would write down what I thought when inspiration struck about the Carmichael.”

Carmichaels have real-world applications and are commonly used for credit card encryptions and online shopping.

While his discoveries have not been verified, Yu’s achievement gained him international recognition and has stunned math experts.

After giving a demonstration of his discoveries at Zhejiang University, using only what he recalled from pure memory as his notes, he has been offered a statistics position at Silk Road Holding Group, an investment company in China.

Get The Brief. Sign up to receive the top stories you need to know right now. Please enter a valid email address. Sign Up Now Check the box if you do not wish to receive promotional offers via email from TIME. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Use and Privacy Policy . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

Contact us at letters@time.com.