114.

X is a British mathematician and a Royal Society Research Professor at Oxford University, specializing in Number Theory. X discovered ______ when he found a book about it at 10 years of age. He was puzzled by the fact that the statement was so simple that he, a ten-year old could understand it. He started working on the statement since 1986, in relative secrecy, and came out with a final solution in 1993. It turned out, however, that this solution had a fundamental gap, to circumvent which took X another year. He announced the final solution in 1995, and the solution has withstood the scrutiny of mathematicians for over 17 years now. Simon Singh wrote a book, titled _____, which chronicled attempts to find solutions to _____ since the time it was first stated. Give X and the blank.