I've done sieving and LLR'ing 15k=187466565 with n from 1 to 100000 and 100000 to 150000 is in progress and I've found some primes. There are many small primes, e.g. n={7,8,11...} as well as some bigger ones, up to ~27000 digits long.

So, what shold I do next?

http://mersenneforum.org/showthread.php?t=640 says "submit them to http://primes.utm.edu/primes/submit.php", but how do I get the "prover id"? There are also "POST PRIMES you've found here..." and "Post small primes..." threads lying around

What primes are considered "small"?

Please, help me to sumbit primes and get credit for them as I'm very confused with all those instructions lying around here...