On 06th of September, grcpool.com, a member of the team Gridcoin found the last prime for base S406.
The prime 100*406^543228+1 has 1.417.027 digits and entered the TOP5000 in Chris Caldwell's The Largest Known Primes Database.
Source: http://srbase.my-firewall.org/sr5/forum ... hp?id=1419