The book is now available! 990
(another Prime Pages' Curiosity)
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+ A prime magic square with magic sum 990:

1515330726973137
16726317101191251
1733731727189103
2272415913293157
7913922931367163
1932576123277179

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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