80530...22123 (109-digits)

This number is a prime.

                                  805309734 5132743362 8318584070 7964601769
9115044247 7876106194 6902654867 2566371681 4159292035 3982300884 9557522123

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The largest prime number that lies within the fraction 355/113 which is the approximation of π discovered by the Chinese mathematician/astronomer Zu Chongzhi. [Pace]