In a 4x4 magic square all rows, columns and the two main diagonals are distinct 4-digit prime numbers when read in either direction.
Create such a square.
Bonus (d4): same for order-5 magic square and 5-digit primes.
L. E. Card,Patterns in Primes, JRM 1:2, 1968, pp .93-99,
(In reply to re: From the computer -semi-spoiler
I did not read Ady as saying that the totals fulfilled the requirements of the standard latin square, rather that a prime was the requirement in row, column and diagonal, and also in the reverse direction.
Posted by brianjn
on 2012-01-14 03:21:16