n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
181: | \[181!!-1\] | 2 × 273653 × 36123048203413577546546159531845345247054663908961815668546410313403826358307413869982741749573552052973799399773817225890767087366592325384315252133030138018779<161> |