n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 151: | \[151!!-1\] | 23 × 30781 × [37379737521118374088867498440822296795664450615117327804026625260743976730876921636310897954442612356328098455062129111950061563<128>] |