4/22/2007

Last month, a French student named Alexis Lemaire became the first human to mentally calculate the 13th root of a 200-digit number:

83689566882369569398
37328662225645224726
78046649383667749735
75581573035075704089
62528802385783156837
68029349382010563433
63855595931514450415
14949070941909770444
93056602684027718696
24155688082648640933

He arrived at the correct 16-digit answer, 2391481494636373, without writing or typing, in 513.55 seconds. Last year he set a new unofficial record for finding the 13th root of a 100-digit number: 3.62 seconds.
-Extracted from The Proceedings of the Athanasius Kircher Society

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