Toby on How the FBI Trailed Paul Erdős for Four Decades

They thought he might be a Hungarian spy:


 
He also offered cash prizes for proofs of conjectures he came up with: 
 
An extra fact about Paul Erdős that didn't make it into my latest video:

Erdős compiled lists of unsolved mathematics problems and offered prizes for anyone who could solve them. The prizes ranged from $25 for "easy" problems and up to $10000 for the most difficult. Many problems remain unsolved today, and this website is attempting to compile them https://www.erdosproblems.com/prizes

If you solve a problem today, you might not be able to claim the monetary prize, but you would contribute something interesting to maths!

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