<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><a href="http://blogs.scientificamerican.com/roots-of-unity/49-ways-to-celebrate-the-most-perfect-day-of-the-year/?WT.mc_id=SA_TW_MATH_BLOG">http://blogs.scientificamerican.com/roots-of-unity/49-ways-to-celebrate-the-most-perfect-day-of-the-year/?WT.mc_id=SA_TW_MATH_BLOG</a></div><div><br></div><div>A little fun with numbers, especially Mersenne primes.<br><br><div><div style="line-height: normal;"><font><span style="line-height: 20px; background-color: rgba(255, 255, 255, 0);">Regards,</span></font></div><div style="line-height: normal;"><span style="line-height: 20px; background-color: rgba(255, 255, 255, 0);"><br></span></div><div><div style="line-height: normal;"><span style="line-height: 20px; background-color: rgba(255, 255, 255, 0);">Dan</span></div><div style="line-height: normal;"><div style="line-height: normal;"><span style="background-color: rgba(255, 255, 255, 0);"> Sample my latest Kindle book, "The Late Mr. Gurlitt," at:</span></div><span style="background-color: rgba(255, 255, 255, 0);"><a dir="ltr" href="http://mybook.to/Gurlitt" x-apple-data-detectors="true" x-apple-data-detectors-type="link" x-apple-data-detectors-result="1">http://mybook.to/Gurlitt</a></span></div><div style="line-height: normal;"></div></div></div></div></body></html>