A magic square filled with consecutive primes

For reference, the 1988 Cray Super computer at "333 MegaFlops" put's it's performance somewhere in the range of last year's iPhone5 (depending on which sort of flop operation you are crunching). I actually think that speaks pretty highly for the Cray. In 1988, a CRAY supercomputer might have almost been enough to run iOS7. However battery life and pocketability would have been somewhat an issue. Also cost at ~10M $ 1988 dollars was pretty expensive, even though it DID come with some brightly colored casing options.

some iPhone5 MFLOP benchmarks: http://www.anandtech.com/show/6330/the-iphone-5-review/5

CRAY YP: https://en.wikipedia.org/wiki/Cray_Y-MP

I don't believe the article defines a magic square (nor was I aware). A magic square is a n by n grid of numbers where each individual row, column, and diagonal add up to the same value.

http://en.wikipedia.org/wiki/Magic_square

I was intrigued by the nextprime() function and had to look it up.

It depends on an isprime() function that in turn relies on the Miller-Rabin test, discussed here: http://primes.utm.edu/prove/prove2_3.html

Interesting that it combines a number of weak, probabilistic tests into a strong test (for n < 1e16)

I wonder if the $100 was enough to pay for the time on the Cray?