A 90-year-old genius, Sir Michael Atiyah, recently claimed to have proved one of the most esoteric of mathematical conjectures, the Riemann hypothesis (RH). His “solution” is probably wrong but it has not yet been definitively rejected by peer review. Cryptographers and crypto-currency investors must have heaved a sigh of relief at the problem remaining unsolved since a proof could render their expertise obsolete.
Mathematical problems that start as abstract exercises can sometimes turn out to have real-world applications. This is true for the RH. There’s a $1 million Millennium Prize from the Clay Mathematics Institute for finding a valid proof