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#1
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⨷Âìà¡ÕèÂǡѺ·Äɮըӹǹàº×éͧµé¹
¤Ô´à·èÒäáçä´é 28 äÁèá¹èã¨ÇèÒã¤Ã¼Ô´¡Ñ¹á¹èÃÐËÇèÒ§¼Á¡Ñº¤¹ÍÍ¡¢éÍÊͺ ¼ÙèÃÙéªèÇÂ䢢éÍʧÊÑ·Õ
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ÊÕèà·éÒÂѧÃÙé¾ÅÒ´ ¹Ñ¡»ÃÒªìÂѧÃÙé¾ÅÑé§ ¢¹Ò´ÍÍÂàÅÍÃ줹´Ñ§ Âѧ¤Ò´ËÇѧ¼Ô´ä»ä´é (Euler's Conjecture) 10 µØÅÒ¤Á 2013 20:20 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ armpakorn à˵ؼÅ: ¾ÔÁ¾ì¼Ô´ |
#2
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$n(ËÒà 2 ŧµÑÇ)+n(ËÒà 7 ŧµÑÇ)-n(ËÒ÷Ñé§ 2 áÅÐ 7 ŧµÑÇ)$
$n(2,4,...,48)+n(7,14,...,49)-n(14,28,42)$ $24+7-3=28$ ªéͼԴ¤ÃѺ |
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