n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
137: | \[137!!-1\] | 24 × 139 × 21611 × 20705258251<11> × 121810824955423<15> × 11989582774271371<17> × 213368913810575231<18> × 22084067056965152239173132884125650639520750621300667<53> |