[ April 1, 2002 ]
Magic Squares composed of only Palindromic Primes
Jean Claude Rosa [email]

There exist Magic Squares composed of only
palindromic primes all with  9 digits .
Jean Claude Rosa confirms this.
No solutions with 3, 5 or 7 digits exist.

147343741	125939521	139626931	Magic Square
129919921	137636731	145353541	all numbers palprimes
135646531	149333941	127929721	by J. C. Rosa April 1, 2002
The Magic Sum equals 3 * (middle cell)

"Voici le carré magique suivant"

In total JCR found exactly  11  Palprimes Magic Squares with 9 digits.
Among these squares there is one that's quite nice:

Two days earlier JCR found a Palprimes Magic Square with  11 digits .
"J'espère que ce carré magique te fera plaisir !"

12434443421	10070707001	11522122511	Magic Square
10430103401	11342424311	12254745221	all numbers palprimes
11162726111	12614141621	10250405201	by J. C. Rosa March 30, 2002
The Magic Sum equals 3 * (middle cell)

and which are all smaller than those found by Carlos Rivera
and Jaime Ayala (22/05/99) and that's on display at
Magic squares composed of only palprimes
"I'm really sorry for Carlos & Jaime."

Here is the next one !
Note that the middle cell determines the order.

[ May 16, 2002 ]
"I (JCR) searched more Palprimes Magic Squares with 11 digits.
I got 89 solutions ( only for the central cell from
1*10^10 up to 2*10^10 ). A little nice collection...
Among these 89 squares I got, five times, two squares
with the same central cell and only once three squares
with the same central cell."

Here are those three squares :

"Allez un petit dernier, assez joli :"

JCR has also obtained the smallest Palprimes Magic Square,
each number in the square has  13 digits .

1026438346201	1000008000001	1013538353101	Magic Square
1000428240001	1013328233101	1026228226201	all numbers palprimes
1013118113101	1026648466201	1000218120001	by J. C. Rosa March 30, 2002
The Magic Sum equals 3 * (middle cell)

Here are three follow ups !

And one more for the road !