Английская Википедия:254 (number)
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Шаблон:Unreliable sourcesШаблон:Infobox number 254 (two hundred [and] fifty-four) is the natural number following 253 and preceding 255.
In mathematics
- It is a deficient number, since the sum of its divisors (excluding the same number) is 130 < 254.[1]Шаблон:Better source needed
- It is a semiprime number.[2][3][1] Moreover, in American English, its name has a semiprime number of syllables.[2]
- It is a square-free integer.[4]
- It is a nontotient.[5]
- It is a lazy caterer number.[6]
- It is a congruent number.[4]
References
