n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 177: | \[177!!-1\] | 25 × 9619201 × 9216766777<10> × 335797727263<12> × 35977224423942003309659093408333557316572740221641626721<56> × 17803689444349524679042404677934725961159637866853180796715157803983522527117<77> |