There is little doubt that of all unsolved problems of mathematics the most widely known and most often attempted is that known as Fermat's Last Theorem.
J111 The integer $M$ consists of 100 threes and the integer $N$ consists of 100 sixes. What digit occurs in the product $MN$?
J101 In $n$ is a positive integer other than $2,3$ or $5$, any square can be dissected into $n$ smaller squares.