Английская Википедия:258 (number)
Материал из Онлайн справочника
258 (two hundred [and] fifty-eight) is the natural number following 257 and preceding 259. Шаблон:Infobox number
In mathematics
258 is:
- a sphenic number[1]
- a nontotient[2]
- the sum of four consecutive prime numbers because 258 = 59 + 61 + 67 + 71
- 63 + 62 + 6
- an Ulam number[3]
References