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#65 Prime magic squares
Set by Peter Rowlett
A magic square is an arrangement of numbers where all rows, columns and diagonals add up to the same number, called the magic constant. Can you complete this square by filling in the missing numbers?
This square was discovered in the early 20th century by Henry Dudeney as a magic square of prime numbers. Unfortunately, it contains 1. Modern mathematicians define prime numbers so that 1 isn’t prime, because it makes lots of results less awkward to state.
An alternative magic square of prime numbers uses 5, 17, 29, 47, 59, 71,…
