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We almost have a solution to an exceptionally tricky mathematical riddle first posed 82 years ago. The problem, known as the Collatz conjecture, is easy to state. Start with any positive whole number.

Bakuage Co., Ltd. headquartered in Shibuya, Tokyo, announced on July 7, 2021, that it is offering a prize of 120 million Japanese yen (*) to anyone who has revealed the truth of the Collatz conjecture ...