3

This number is a prime.

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There exists 3 and only 3 groups (or generations) of quark couples as well as those of lepton couples that comprise the entire family of elementary particles of matter known as fermions. [Beedassy]

The smallest Gaussian prime. [Beedassy]

The smallest prime with a prime subscript. [Beedassy]

The smallest prime with prime period continued fraction for its square root. [Beedassy]

The only odd prime that is a highly abundant number. [Beedassy]

The only prime p such that (p⁵ - 1)/(p - 1) is the square of a prime. [Beedassy]

The only number that is both an odd prime number and a highly composite odd number. [Beedassy]

According to Hindu scriptures the Universe is a 3-world-cosmology abode called "Triloka" that comprises the perceptible Physical world along with the subtler realms of the Celestial and the Nether worlds. [Beedassy]

"Houray !" exclaimed aloud 3 times in response to "Three cheers for ...": "Hip Hip Hip !" (uttered 3 times in succession) is a common jubilatory and glorifying interjection during social gatherings in many British-impregnated cultures. [Beedassy]

The area under a cycloid is 3 times the area of the generating circle. [Beedassy]

In a paper dated 19 Feb 2016, authors J. Cilleruelo, F. Luca, L. Baxter proved any positive integer is the sum of 3 palindromes in base 5 or beyond. [Beedassy]

"Thirdsday" comes once every seven years or so, whenever January 3 falls on a Thursday. [Beedassy]