A lucky hit after starting the Formula BOINC challenge.
416Ed4Gqcz8tpVzmSFSdVynvgyKP found a megaprime for base R684.
The prime 39*684^519468-1 has 1.472.723 digits and entered the TOP5000 in Chris Caldwell's The Largest Known Primes Database. With this find it also has proven the base!
Source
Actualités en direct des projets (non traduites)
SRBase - base R684 Megaprime / proven
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