Human Calculator

Dan

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"The fastest human calculator has broken his own mental arithmetic world record. Alexis Lemaire used brain power alone to work out the answer to the 13th root of a random 200-digit number in 70.2 seconds at London's Science Museum.

The 27-year-old student correctly calculated an answer of 2,407,899,893,032,210, beating his record of 72.4 seconds, set in 2004.

The so-called 'mathlete' used a computer package to randomly generate a number before typing in the answer. Mr Lemaire began demonstrating his mental calculation prowess by finding the 13th root of a random 100-digit number.

Science Museum curator Jane Wess....
This feat soon became too easy for him and he abandoned trying to improve his time when he calculated an answer in less than four seconds in 2004.

In an attempt to sharpen his brain, Mr Lemaire trains daily for the considerably more difficult task of finding the 13th root of a random 200-digit number. Lemaire broke the record in the Science Museum's History of Computing galley, where he had a backdrop of Charles Babbage's Difference Engine No.2, the world's first successful mechanical calculator, designed in the 1840s.

Jane Wess, curator of mathematics at the London Science Museum said: "He sat down and it was all very quiet - and all of a sudden he amazingly just cracked it. "It's quite remarkable to see it happen. A very small number of people have this extraordinary ability.

"I believe that it is the highest sum calculated mentally."

My Lemaire was later seen struggling to select songs for his I-Pod on his I-Tunes, he was later heard to say "Funkin apple rubbish".
 
This was in the image dump :D

mathsolveoy0.jpg
 
I am curious to know how fast a typical PC would take to do this calculation.
 
I think I saw this in a magazine article, too.

Guy's famous. Awesome.
 
Useless? He doesn't need a calculator (for any program he commits to memory that is). Seems far from useless to me.
 
Yea, it's probably not useless, but the average person probably would get too much use out of that skill.
 
oh yeah of course, for example in grocery store when you need to calculate 200-digit numbers.
 
I think that couple who spent all day in Tescos might be able to rack up a 200 digit bill...
 
I think I watched a documentary about this a little while ago. It was amazing.
 
This person also learned Icelandic in a week
 
You know, he doesn't actually calculate the roots, just remembers tables of numbers.
 
You know, he doesn't actually calculate the roots, just remembers tables of numbers.

Umm.. there are 293 trillioin possibilities for the 13th root of a 200 digit number. I don't think he is memorizing tables of 13th roots. He might know smaller multiplication tables that help the process. Probably he is using some form of recursion and Newton's method to home in on the correct answer (similar to how a computer does it).
 
Umm.. there are 293 trillioin possibilities for the 13th root of a 200 digit number. I don't think he is memorizing tables of 13th roots. He might know smaller multiplication tables that help the process. Probably he is using some form of recursion and Newton's method to home in on the correct answer (similar to how a computer does it).
Well I just read an interview with him a while ago saying he just memorizes number tables and the such.
 
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