This number is a prime.

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There are in all 173 distinct configurations on a Euclidean plane for the arrangement of 4 circles, not necessarily all identical, not allowing osculations nor three or more common intersection points. [Note configuration here means circle-drawable, not just topologically distinct] [Beedassy]

Submitted: 2019-04-15 13:02:23;   Last Modified: 2019-04-15 13:52:28.
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