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Il numero primo più grande del mondo ha oltre 23 milioni di cifre ed è stato scoperto il 26 dicembre da uno statunitense. Per scriverlo occorrerebbe un volume di migliaia di pagine e per leggerlo tutto ci vorrebbe praticamente un anno. Per comodità viene denominato M77232917.
Il suo "inventore" è Jonathan Pace, un ingegnere di 51 anni del Tennessee, che per scovarlo ha impiegato circa due anni, utilizzando dei software gratuiti del Great Internet Mersenne Prime Search.
Perché dare la caccia ai numeri primi? Per la bellezza del calcolo in sé (risponderebbero gli appassionati). Resta tuttavia da vedere per quanto tempo M77232917 conserverà il suo record, dal momento che - come aveva dimostrato Euclide 2'300 anni fa, i numeri primi sono infiniti.
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