n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
141: | \[141!!+1\] | 25 × 1163 × 47957414054060203203716306745208471818391<41> × 75203649905906222686420269360308371727484708151015372905180742668444432105571<77> |