Prime Magic Square

[Brendan McKay]

Carlos Rivera kindly reminded me that the sum is always
3 times the middle element, so it can't be a prime.  But
thanks for letting me not be the only one to make this
mistake in public ;-).

At the risk of looking even sillier: what about larger squares?

Brendan.

* David Wilson <davidwwilson at attbi.com> [020826 12:10]:
> Primes not at the center of a 3x3 magic square of distinct primes
> 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 61 67 79 83 97 101 107 113
> 163 181 197 199 223 229 233 277 313 317 331 433 439 457 569 859
> 
> There are no others < 10000.
> 
> I stopped checking at 10000.
> 
> 
>