Delta potential: Difference between revisions

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m Dating maintenance tags: {{Context}}
 
en>Wabber
recalculated everything myself and without that minus the conclusion in the next sentence about \lambda being negative doesn't make any sense. If \kappa was negative \psi would diverge.
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{{Infobox number
| number = 217
}}
'''217''' is the [[natural number]] following [[216 (number)|216]] and preceding [[218 (number)|218]].
 
217 is a [[centered hexagonal number]], a [[polygonal number|12-gonal number]], a [[centered polygonal number|centered 36-gonal number]], and a [[Blum integer]].<ref>[http://www.virtuescience.com/217.html The Number 217], Virtue Science</ref> 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]].<ref>[http://oeis.org/A163205 The non-repetitive Kaprekar binary numbers in decimal], OEIS</ref>
 
==See also==
*[[217]], the year
 
==References==
{{reflist}}
 
{{Integers|2}}
[[Category:Integers]]
 
[[ca:Nombre 210#Nombres del 211 al 219]]

Revision as of 14:16, 2 February 2014

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.[1] It is both the sum of two positive cubes and the difference of two positive consecutive cubes in exactly one way: 217=63+13=93−83. When written in binary, it is a non-repetitive Kaprekar number.[2]

See also

References

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Template:Integers

ca:Nombre 210#Nombres del 211 al 219

  1. ↑ The Number 217, Virtue Science
  2. ↑ The non-repetitive Kaprekar binary numbers in decimal, OEIS
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