### The 13th Root of a 200-Digit Number. In Your Head. Starting... now!

*On April 6th, 2005, Alexis Lemaire from France became the first human to calculate mentally the 13th root of a 200-digit number. He took 742 attempts and 513.55 seconds, exactly 500 seconds more than his first world record in 13.55 seconds with 100 digits.*

83689566882369569398373286622256452247267804664938

36677497357558157303507570408962528802385783156837

68029349382010563433638555959315144504151494907094

19097704449305660268402771869624155688082648640933

His correct answer was 2391481494636373.

83689566882369569398373286622256452247267804664938

36677497357558157303507570408962528802385783156837

68029349382010563433638555959315144504151494907094

19097704449305660268402771869624155688082648640933

His correct answer was 2391481494636373.

I know exactly what you're thinking: 742 attempts? HOW LAME!

Yeah, I know, it's the last three digits that are the hardest. I was like all totally 2391481494636378, too. Feeling your pain.

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