For example, is pernicious since it containes 3 ones and 3 is a prime number.
The smallest 3 × 3 magic square whose entries are pernicious numbers is
7 | 17 | 6 |
9 | 10 | 11 |
14 | 3 | 13 |
Below, the spiral pattern of pernicious numbers up to . See the page on prime numbers for an explanation and links to similar pictures.
The first pernicious numbers are 3, 5, 6, 7, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21, 22, 24, 25, 26, 28, 31, 33, 34, 35, 36 more terms