This has no correlation with the original post, but I have heard this name before prometheus.
I used to work for subway and had a regular customer, after speaking with this older gentleman, I found out he was an old school hacker. I found out because I told him my major in college and some of my hobbies.
Anyway, he was one of the first few in the HomeBrew Computer Club, and has seen and worked on many things, even along side Woz and other big names. He has coached me in C and taught me many things I hold of high standards in hacking, programming, and general ethics of codemonkeys. I still don't know his real name, but I know what he wants from subway (footlong meatball on wheat, light in the sauce, provolone cheese, toasted, with green pepper and onion, extra cheese and spices if avail.)
The only name I knew him by was Prometheus, he never told me how he spelled it, or where I can find him online. But I know for a fact he was legit from the things he has told me, and coached me on.
So this name you bear, do it justice. Learn what you can and be what the man I once knew did.
(This would have been posted in your intro, but the thread was too old, so I am sharing my story now.)
As for the original post, nice find. I been looking for something to hone what I know. projecteuler.net isn't really for me, too math heavy. Nice find.