n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
* 171: | \[171!!-1\] | 2 × 619 × 618929 × 5761192133<10> × [25795962689050760453988841712556576008358720749746805917463952806349380290445452001415057212109044380319704689774329759010536632471729339<137>] |