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#1
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ÍÂÒ¡¶ÒÁ˹èͤÃѺ
1.¨§áÊ´§ÇèÒ ¡Ó˹´ $a_n=200620062006...2006$ ($n$ ¾¨¹ì)¨Ðä´éÇèÒ $$2549\mid a_n$$ ÊÓËÃѺºÒ§ $n\in Z^+$
2. ¹Ò ¡. µéͧ¡ÒëéÍÁẴà»ç¹àÇÅÒ 25 Çѹâ´Â·Õè«éÍÁÍÂèÒ§¹éÍÂÇѹÅÐ 1 ૵à»ç¹¨Ó¹Ç¹ 36 ૵¨§¾ÔÊÙ¨¹ì ÁÕªèÇǧàÇÅÒ·ÕèµÔ´µè͡ѹ·Õè¹Ò ¡. «éÍÁẵä´é 13 ¾Í´Õ ÊÓËÃѺ¢éÍ1. ¼ÁàÃÔèÁ¤Ô´¨Ò¡ $(2006,2549)=1$ áÅмÁÊÃéÒ§¹¡à·èҡѺ $2550$ µÑÇáÅÐÃѧ¤×ÍàÈÉ·Õèä´é¨Ò¡¡ÒÃËÒôéÇ $2549$ «Öè§ËÅÑ¡¡ÒÃÃѧ¹¡¾ÔÃÒº¡çä´éáÅéǹФÃѺ ÊÓËÃѺ¹¡·Õè¤Ô´ä´éà»ç¹»ÃÐÁÒ³¹ÕéÁÑé§ $1,10001,100010001,1000100010001,...,100010001....10001$ (àÅ¢ $1$ ã¹¾¨¹ìÊØ´·éÒÂà·èҡѺ $2550$ µÑÇ) äÁèÃÙé¶Ù¡ËËÃ×Íà»ÅèÒ 2. ¼ÁÃÙéá¤èÇèÒ ÁÕÍÂèÒ§¹éÍ $1$ Çѹ·Õè¹Ò ¡.«éÍÁÍÂèÒ§¹éÍ $1$ ૵ ¹Í¡¹Ñ鹡çäÁèÃÙéÍÕ¡áÅéǤÃѺ Âѧ䧡çªèÇ·չФÃѺ |
#2
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1. àÅ×Í¡ $n=637$
ÊѧࡵÇèÒ $a_{n}=2006(1+10^4+\cdots+10^{4n-4})$ $~~~~=\dfrac{2006(10^{4n}-1)}{9999}$ à¹×èͧ¨Ò¡ $2549$ à»ç¹¨Ó¹Ç¹à©¾ÒÐ $10^{2548}\equiv 1 \pmod{2549}$ â´Â Fermat's little theorem ´Ñ§¹Ñé¹àÅ×Í¡ãËé $4n=2548$
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site:mathcenter.net ¤Ó¤é¹ |
#3
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¢éÍ 2 ·ÓÍÂèÒ§¹Õé¤ÃѺ
ãËé $a_i$ á·¹¨Ó¹Ç¹à«µÊÐÊÁ㹡ÒëéÍÁẴÁÔ¹µÑ¹ ¨¹¶Ö§Çѹ·Õè i áÅоԨÒÃ³Ò $a_1,a_2,\cdots a_{25} ,a_1+13 ,a_2+13,\cdots a_{25}+13$ (àÊÁ×͹ ¹¡) ¨Ð¾ºÇèҨӹǹ 50 ¨Ó¹Ç¹àËÅèÒ¹ÕéÍÂÙè㹪èǧ 1-49 (àÊÁ×͹Ãѧ) ·ÕèàËÅ×Í¡çäÁèÂÒ¡áÅéǤÃѺ
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