8171

This number is a prime.

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Prime 8171 is the integer part of the area of a circle with radius 51 (full value is 8171.282491987...), and it is the largest four-digit prime of this type. The next prime like this is 11689, for a circle with radius 61. [Keith]

Submitted: 2023-12-01 23:21:16; Last Modified: 2023-12-02 00:30:42.