- 233 (number)
233 is the
natural number between 232 and 234. It is also aprime number .In mathematics
233 is an
irregular prime , afull reptend prime , acousin prime , aChen prime , and asexy prime . It is anEisenstein prime of the form with no imaginary part. Since 233 × 2 + 1 = 467, another prime, 233 is aSophie Germain prime . 233 is also aprime triplet (with 227 and 229).It is a
Fibonacci number , being the sum of 89 and 144. Being an odd-indexed Fibonacci number, it is also aMarkov number , appearing in solutions to the Markov Diophantine equation: (1, 89, 233), (89, 233, 610), (233, 610, 426389), ...In base 10 there is no integer that added up to its own digits yields 233, hence 233 is a
self number . In base 3, the sum of 233's digits is composite, no smaller prime has this property.In other fields
In current teenage
slang and Internet discourse, 233 is sometimes used instead ofBFF to abbreviate "Best Friends Forever." The digits correspond to the number keys that would be pressed on a telephone while sending a text message. In Windows live messenger 233 is a commonly used to represent the emoticon of raised eybrows.
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