9

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Regular nonagon is the only regular polygon such that n^n +(n-2)*180/n (387420629) and ((n-2)*180/n)^n+n (20661046784000000009) are both prime. Note that (n-2)*180/n is an internal angel of a regular polygon. [Sariyar]

Submitted: 2019-04-18 12:57:08; Last Modified: 2019-04-18 14:04:53.