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A BEARDED French university student has been hailed as the greatest human calculator after solving in under nine minutes the ultimate mental arithmetic challenge: finding the 13th root of a 200-digit number.
Watched by official timekeepers, Alexis Lemaire, 24, a computer science student from Reims, took just 513 seconds to work out the 16-digit number that multiplied by itself 13 times produces a 200-digit sequence. He was not allowed to use any aid or write or type anything.
Thirteenth roots have long been used as a test for records, because 13 is a prime number whose roots cannot be obtained by combining those of other numbers.
Mr Lemaire amazed mental mathematicians in December when he beat the record for finding the 13th root of a 100-digit number in 3.62 seconds, against 13.55 previously.
The student, who is learning 40 languages simultaneously in his spare time, has promised to reveal part of his technique. Would-be challengers are directed to the website www.13throot.com.
From The Times of London in The Australian