k.2^n-1

Help us find prime numbers with your PC!

15k*2^n-1 may be prime! (odd k)

News - December 8, 2003

We added the 15k Candidates section to www.15k.org.
If you want to find a prime that qualifies for the
Top 5000 prime list, select one from the
15k Candidates list. Then follow the instructions
in the HowTo section.

News - December 1, 2003

Jocelynl has found 210885*2^270025-1 is prime!
This one will go into the top 5000 list at #529!
Mark found 210885*2^301665-1 is prime!
Phase 2 has now found 4 primes for 210885!

We are currently gathering information on 15k numbers
by having volunteers run selected 15k's
We have instruction on how to get started on the Forum
Primes found in the current test range will place them and YOU
on the 5000 Largest Primes list!

We are also just starting the 2nd phase where we will
test selected 15k's as a team to a larger n to find
more information about their primes!

Once phase 2 has enough information, we will select 1 or 2
15k's to test in the 10,000,000 digit range! If you were to find
a prime in this range, it would qualify for the EFF's $100,000 prize
if it's the first 10,000,000 digit prime found!

Thank you to Shane F (TTn)

for starting the 15k search!

This will always be his project,

We are just continuing it!

Thanks to Jocelyn

for creating this web site

and the Statistics page!

Thanks to Mike Vang

for the 15k*2^n-1 logo!

Thanks to Jean Penne

for writing LLR.

Thanks to Paul Jobling

for a handy sieve.

NewPGen

Thanks to Thomas Ritschel

for helping start up 15k

and for his crucial sieving work,

and code skills.

Thanks to John Brennen for

a close software match of

Robinson weights (k*2^n+/-1)

Thanks to Chris Nash for

his psieve software.

Thanks to Chris Caldwell for

The worlds best database,

and information source on

prime numbers.

Thanks to all our members

who have joined the search!