| This indicates how the number is currently listed in the database. | |
| C | Composite, no factors known |
| CF | Composite, factors known |
| FF | Composite, fully factored |
| P | Definitely prime |
| Prp | Probably prime |
| U | Unknown |
| Unit | Just for "1" |
| N | This number is not in database (and was not added due to your settings) |
| * | Added to database during this request |