n!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
270: | \[270!!!!-1\] | 319821581531<12> × 46131951601857494505779447775169708840369809554111126246598818009204437735251232004941303322112626536880704836278122319507629<125> |