218169499
This number is a prime.
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The smallest odd prime formed from the leading digits of
the volume of a regular
icosahedron with unit length (2.18169499...). With two
consecutive 9s at this point, this value formed by first 7
digits stands out as a strong approximation. [Gudipati]
Submitted: 2026-06-23 15:15:52; Last Modified: 2026-06-23 15:16:47.
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