n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
125: | \[125!!-1\] | 2 × 127 × 268637 × 107166684799<12> × 111592177070247059<18> × 1267431736710514785501037<25> × 1254301908702236448005876629218227368408966189<46> |