1
This number is a unit (so is neither prime nor composite).
Single Curio View: (Seek other curios for this number)
Henry Ernest Dudeney's 3-by-3 magic square contains "1" nonprime:
| 67 | 01 | 43 |
| 13 | 37 | 61 |
| 31 | 73 | 07 |
Submitted: 1999-09-02 23:40:00; Last Modified: 2022-02-18 21:12:23.
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