This number is a prime.
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"KOI 29?" is the equivalent French acronym for "WU?" meaning "What's up ?" in chat language. [Beedassy]
The number of letters in the full name of the mathematician in whose honor was coined the hypothesis that still underlies the current core problem in the theory of primes: Georg Friedrich Bernhard Riemann. [Beedassy]
The first prime p of a twin-prime pair (p, q) such that exactly p prime digits are used in writing out the first q primes. [Beedassy]