--- In

primenumbers@yahoogroups.com, "cino hilliard"

<hillcino368@h...> wrote:

>

> One poster claims to factor 150,000 digit numbers. Here is a 350

digit

> number. I do not see it any

> different than the RSA challenges in this category. We will see.

Try running a few ECM curves on F20 (20th Fermat Number) and you'll

be attempting to factor a 315,653 digit number. Factoring of 150k

digit numbers is nothing new in the 21st Century. :)

As to the RSA comparison... When you're willing to put up $20k in

prize money, I suspect you'll get people trying to factor your

number. But if you do, make certain to post a reasonable challenge

and/or a reasonable reward. The next RSA challenge (RSA-640, $20k

prize) is only 193 digits with factors estimated at 85-88 digits.

While the RSA-1024 challenge is 309-digits with a $100k prize. So I

figure you'll need about $250k as a prize to get anyone to take your

challenge very seriously.