10000...00231 (288-digits)

This number is a prime.

                                                                    10000000
0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000
0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000
0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000
0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000231

+ The smallest prime that's just too (two) gross to talk about in polite company. Note that it contains 2 * 144 digits. [Patterson]

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