“Martin Gardner was one of the great intellects produced in this country in the 20th century,” said Douglas Hofstadtler. From 1956 to 1986, Gardner was the author of the “ Mathematical Games” column for Scientific American. He wrote more than 70 books and essays ranging from magic tricks to philosophy, religion, and recreational mathematics.

In 1987 Martin Gardner offered $100 to anyone who could find a 3 3 3 magic square made with consecutive primes.
The prize was won by Harry Nelson of Lawrence Livermore Laboratories. He produced the following simplest such square:

Prove this is a magic square.

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$100 REWARD