n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 237: | \[237!!+1\] | 25 × 239 × 28161611 × 117163775241907<15> × [75854045226888200395107256455469605882576000693191787204742641885219394492596243937945176632289339747245513890947544162920629628075598646745342115117964418871216155519345082757265750748501878377187712307831<206>] |