n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
93: | \[93!!-1\] | 2 × 479 × 2441 × 3693707 × 68702986726487<14> × 132396540831683<15> × 2702798579086537<16> × 14068143711441047<17> |