13th Root - Records

Records

The Guinness Book of World Records has published records for extracting the 13th root of a 100-digit number. All world records for mentally extracting a 13th root have been for numbers with an integer root.

  • The first record was 23 minutes by De Grote(Mexico).
  • The most published time was at one time 88.8 seconds by Klein(Netherlands).
  • Mittring calculated it in 39 seconds.
  • Alexis Lemaire has broken this record with 13.55 seconds. This is the last official world record for extracting the 13th root of a 100-digit number.
  • Mittring attempted to break this record with 11.8 seconds, but it was rejected by all organizations (Saxonia Record club, Guinness, 13th root group).
  • Lemaire broke this record unofficially 6 times, twice within 4 seconds: the best was 3.625 seconds.
  • Lemaire has also set the first world record for the 13th root of a 200-digit number: 513.55 seconds and 742 attempts on April 6th, 2005, and broken it with 267.77 seconds and 577 attempts on June 3rd, 2005.
  • The same day, Lemaire has also set in front of official witnesses an unofficial record of 113 seconds and 40 attempts.
  • On February 27th, 2007, he set a world record of 1 minute and 47 seconds
  • He broke this record on July 24th, 2007 with a time of 1 minute and 17 seconds (77.99 seconds) at the Museum of History of Science, University of Oxford, UK
  • Lemaire broke his record on November 15, 2007 with a time of 72.4 seconds
  • Lemaire broke his record on December 10, 2007 with a time of 70.2 seconds

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