10000...00289 (91-digits)

This number is a prime.

                                                     1 0000000000 0000000000
0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000289

+ 10^90 + 289 is the smallest prime greater than a British quindecillion. [Behland]

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