Английская Википедия:217 (number)

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Шаблон:About Шаблон:Infobox number 217 (two hundred [and] seventeen) is the natural number following 216 and preceding 218.

In mathematics

217 is a centered hexagonal number, a 12-gonal number, a centered 36-gonal number, a Fermat pseudoprime to base 5, and a Blum integer.[1] It is both the sum of two positive cubes and the difference of two positive consecutive cubes in exactly one way: <math>217 = 6^3 + 1^3 = 9^3 - 8^3</math>. When written in binary, it is a non-repetitive Kaprekar number.[2] It is also the sum of all the divisors of Шаблон:Num.

See also

References

Шаблон:Reflist

Шаблон:Integers

ca:Nombre 210#Nombres del 211 al 219