I have found a new record for 15 Largest Known Simultaneous Primes:

CC15 (1st kind, 41 digit first term):

27353790674175627273118204975428644651730*2^n-1, n=0..14

(Apr 25, 2014, Jaroslaw Wroblewski)

43 digit 8-th term 3501285206294480290959130236854866515421439

I applied a litlle trick, namely created and used polynomial

P(x) = 86730930*x^2,

which has nice property of having over-average density of Cunningham Chains

P(x)*2^n-1

The above Cunningham Chain is obtained for

x=17759132926784169, so it can also be written as

86730930*17759132926784169^2 * 2^n - 1, n=0..14

The search was very lucky (only one CC13 and the above CC15 was found)

and short (2 hours of 60 threads).

Jarek