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Template:Sequence of the Day for December 8
From OeisWiki
Intended for: December 8, 2012
Timetable
 First draft entered by Alonso del Arte on December 7, 2011 ✓
 Draft reviewed by Daniel Forgues on December 8, 2011 ✓
 Draft approved by Alonso del Arte on November 5, 2012 ✓
Yesterday's SOTD * Tomorrow's SOTD 
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√ 8 

2.8284271247461900976...
This is the second Lagrange number, used in the Hurwitz irrational number theorem to obtain very good rational approximations of irrational numbers other than multiples of the golden ratio.