n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 87: | \[87!!-1\] | 23 × 7219 × 19773600433<11> × 646461002351578832087<21> × 5372655613219348007921857473947<31> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 87: | \[87!!-1\] | 23 × 7219 × 19773600433<11> × 646461002351578832087<21> × 5372655613219348007921857473947<31> |