Quote from: Clark on July 13, 2013, 08:31:44 PM

If I'm not mistaken, Block 28769 contains the new world record for BiTwin of four links (10 primes / TWN0a), 100 digits.

Also, the BiTwin primes listed on the records contain only even numbers of primes, yet our mining uncovers chains like TWN07, TWN09, etc. How are these defined? Do they count toward official records?

Odd numbered twin prime chains are defined as having only half of the final pair. I doubt the record books would care about the final pair, since it's a prime and a composite, so TWN07 is really a TWN06 and TWN09 is just TWN08. The odd numbered chains work just fine as a proof of work, though, and seem to behave nicely as far as difficulty is concerned.