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This list is recognized by all organisations which check this category, the mental calculators, Record Club Saxonia, and 13throot.com
Update: January 23rd, 2005
OFFICIAL RECORDHOLDERS LIST
1 SINGLE TASK, 13TH ROOT OF A 100-DIGIT NUMBER
Alexis Lemaire
French, 13.55 seconds
Villers Marmery France, May 10th 2002
UNOFFICIAL RECORDS WITH CORRECT TIMING
1 SINGLE TASK, 13TH ROOT OF A 100-DIGIT NUMBER
Alexis Lemaire
French, 3.625 seconds
Reims, France, December 17th 2004
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group about the 13th root
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