The 13th root of a number is a figure that must be multiplied 13 times by itself to reach the original. For example, the 13th root of one is one, the 13th root of 8,192 is two, and of 96,889,010,407 is seven. the situation for a 200 digit number always begins with a two, whereas that for a 100 digit number always begins with a four. The 13th root of a number will usually have approximately one thirteen the number of digits of the original. So the 13th root of a 100 digit number has eight digits and that of a 200 digit number has 19 digits. There are more than 3.9 trillion possible solutions for the 13th root of a 200 digit number.
The above is taken from today's Telegraph. Yesterday Alexis Lemaire broke the world speed record for calculating the 13th root of a 200 digit number generated at random. He didn't use a calculator and finished the job in 70.2 seconds. Mr Lemaire is working on an artificial intelligence PhD at the University of Reims. His plan is to download the way his brain works to a computer programme. He calls this mind uploading. At last there may be someone who could master the formula by which National Assembly money is distributed to local authorities in Wales.