Mother of math.
Wow.... I ..... and? .... but .....? *sigh* .... I feel entirely under-productive now.
next time I need one of these I'll know where to look!
I know it's already been said, but as an even integer gets larger, the number of ways to write it as the sum of two primes generally does as well.
"... and every cell is prime!!!" Just how long was this guy in prison?
from the page: "The Journal of Recreational Mathematics published this remarkable magic square, composed by a puzzlist who at the time was a prison inmate.
The large 13 x 13 square is magic, that is, each row and column adds to the same sum but so is each successive nested square, from 11 x 11 down to 3 x 3.
The magic constant of each square is 10,874 smaller than the last.
And every cell is prime."
I don't know whether to cry or be awestruck...