Delta potential

Template:Infobox number 217 is the natural number following 216 and preceding 218.

217 is a centered hexagonal number, a 12-gonal number, a centered 36-gonal number, and a Blum integer. It is both the sum of two positive cubes and the difference of two positive consecutive cubes in exactly one way: $217=6^{3}+1^{3}=9^{3}-8^{3}$. When written in binary, it is a non-repetitive Kaprekar number.

See also

• 217, the year

References

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