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Re:Famous Unsolved Math Problems as Homework by ggchappell on Wednesday May 13, 2015 @02:29PM (#9540989)
> ... who has taken this approach the farthest these days.

Tomás Oliveira e Silva of the Universidade de Aveiro, in Portugal, apparently. According to a page on his personal website [http://sweet.ua.pt/tos/3x+1.html] he has verified it up to 5 x 2^60.

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