Delta potential: Difference between revisions
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en>AnomieBOT 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 15:16, 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: . When written in binary, it is a non-repetitive Kaprekar number.[2]
See also
- 217, the year
References
43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.
ca:Nombre 210#Nombres del 211 al 219
- ↑ The Number 217, Virtue Science
- ↑ The non-repetitive Kaprekar binary numbers in decimal, OEIS