n!!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 255: | \[255!!!!!-1\] | 61 × 103 × 2672233481 × 20777971561<11> × 238723344608502620562263<24> × 8271338052252098748812035275672611974234319652053708891<55> |