n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 201: | \[201!!+1\] | 2 × 1019 × 2647 × 2737597 × 343069589 × 356708023909<12> × 741410510154155922747050332884643792830915348201144081071072041602875848519595425067920841852911146564095216291016947537697589784677046712673829914375959353<156> |