A genius. I gave up trying to do it. Even using computer couldn't churn out 100 digits.
"Alexis Lemaire is surely the most amazing calculating prodigy of the past, present and future. His first world record was the calculation of the 13th root of a 100-digit number, in 13.55 s. If the time is certainly not the fastest possible, there were so many coincidence that only something surnatural could explain them.
Alexis Lemaire has created a scientific/surnatural explanation of these coincidences, which is certainly the most amazing human discovery in History
this explanation has leaded to other surnatural facts, described scientifically.
The ultimate category is the 13th root of a 200-digit number, his favorite calculation. The record in 13.55 s is the last official record for this category, and therefore no official record has broken it.
On December 17th, 2004, he broke the unofficial record 11.8 s (November 23rd, 2004) by 3.625 s, And proved that he is every time 3 times faster than his challenger Gert Mittring"
[13throot.com]Some properties of 13th roots
The first property of the 13th root is that the last digit of the 13th root is always the same as the last digit of the power. Therefore the calculating prodigies have just to copy the last digit to find the easiest part of the answer.
In the case of the 13th root of a 100-digit number there are 7992563 possibilities, the range is 41246264-49238826
There are in this case only 8 digits in the answer, this is an easy calculation.
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