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
Hi, Brian & Charlie,
I MISLEAD YOU GUYS, the squares are neither magic nor
THEY ARE "SPECIAL" **
judging from the sum (=70), Brian's solution is OK.
There is only one (discounting reflexion and rotation) solution for 4X4 and three(discounting reflexion and rotation) different solutions for 5X5.
Go for them , B&C.!!
**Sorry for using a wrong word , which has a well-defined meaning.