[SG-FC] dingdong, a member of the team SETI.Germany found a megaprime for base S48.
The prime 561*48^711808+1 has 1.196.724 digits and entered the T5k PrimePages.

Dukebox, a member of the team Dutch Power Cows found a megaprime for base S48.
The prime 153*48^825719+1 has 1.388.236 digits and entered the T5k PrimePages.

Source