| Answer | Crossword Clue |
|---|---|
| EVEN | Like all known perfect numbers |
| NONZERO | Like all odd numbers |
| POS | Like all natural numbers: Abbr. |
| ODD | Like all prime numbers but 2 |
| ODD | Like all prime numbers except 2 |
| ODD | Like all prime numbers besides one |
| ODD | Like all prime numbers but one |
