n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
* 173: | \[173!!-1\] | 2 × 1126711 × 222352808044440559<18> × [39317557498730185267806098443952266938973808871693260977464612489431931458138784331856297158128267810910502390564947323064291444066663<134>] |