One other quick item from Eureka, the journal of the Cambridge University Mathematical Society:
In its 1947 problem drive, the society proposed the following problem:
To find unequal positive integers x, y, z such that
x3 + y3 = z4.
“Although there were some research students in Theory of Numbers among those who tried, not one person succeeded in solving it within the time, yet the solution is extremely simple.” What is it?