n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 81: | \[81!!+1\] | 2 × 101 × 277 × 1961537 × 113926027876291680503<21> × 516793744354438153942241838079<30> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 81: | \[81!!+1\] | 2 × 101 × 277 × 1961537 × 113926027876291680503<21> × 516793744354438153942241838079<30> |