n!!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 521: | \[521!!!!!-1\] | 52 × 19874264429<11> × 227780774569<12> × [1238546247615453994171941448769367049654208511918011567977523070095194081182208493994770408187008991725671149673429664504888633169515967522036547354549464568762254728622501322487639853973614792468294667115436505139227<217>] |