990
This number is a composite.
A prime magic square with magic sum 990:
| 151 | 53 | 307 | 269 | 73 | 137 |
| 167 | 263 | 17 | 101 | 191 | 251 |
| 173 | 37 | 317 | 271 | 89 | 103 |
| 227 | 241 | 59 | 13 | 293 | 157 |
| 79 | 139 | 229 | 313 | 67 | 163 |
| 193 | 257 | 61 | 23 | 277 | 179 |
Composed of distinct primes, it is both pandiagonal and symmetrical. [Johnson]
(There is one curio for this number that has not yet been approved by an editor.)
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