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      /  ¼x¨D°ª¤âÀ°¦£¤@¤U
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linian
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µù¥U¤é: 2005-11-07
µoªí¼Æ: 292


 ¼x¨D°ª¤âÀ°¦£¤@¤U

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©Ò¦³nÄÝ©óN¡An¤j©óµ¥©ó3
¦³a,bÄÝ©óA
(A={xlx=2k-1,kÄÝ©óN})
let 7a^2+b^2=2^n


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˦Çq•MÆõ³õ©ÒÇV
¤@ºüÇGÇO«HÆþÇMÆêÇeÇ@

 2006-01-06 21:58­Ó¤H¸ê®Æ¶Ç°e Email µ¹ linian«ô³Xºô¯¸
³X«È








 Re: ¤S¬OÃøÃD

¥´¿ù­ù !

¬O{...x=2k-1...}

 2006-01-06 22:19
linian
Home away from home



µù¥U¤é: 2005-11-07
µoªí¼Æ: 292


 Re: ¤S¬OÃøÃD

thank


_________________
KH~~
ÆùÇUªÅÆòÇKÇQÆö¥@¬ÉÇN
˦Çq•MÆõ³õ©ÒÇV
¤@ºüÇGÇO«HÆþÇMÆêÇeÇ@

 2006-01-06 22:20­Ó¤H¸ê®Æ¶Ç°e Email µ¹ linian«ô³Xºô¯¸
³X«È








 Re: ¤S¬OÃøÃD

¬O2k-1¨S¿ù°Õ
³o£|ÃD¥Ø¦n¹³¬Ý¹L£®
¦ý¬O´N¬O¤£·|ÃÒ©ú£«

§b§b

 2006-01-06 22:41
linian
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µù¥U¤é: 2005-11-07
µoªí¼Æ: 292


 Re: ¤S¬OÃøÃD

½Ð¤j®aÀ°¦£¤@¤U¡IÁÂÁÂ


_________________
KH~~
ÆùÇUªÅÆòÇKÇQÆö¥@¬ÉÇN
˦Çq•MÆõ³õ©ÒÇV
¤@ºüÇGÇO«HÆþÇMÆêÇeÇ@

 2006-01-07 20:36­Ó¤H¸ê®Æ¶Ç°e Email µ¹ linian«ô³Xºô¯¸
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 Re: ¼x¨D°ª¤âÀ°¦£¤@¤U

³o½Ö°Ý£x

¤Ó¨k£{§a

½Ð°Ý¦b­þ¤@¥»®Ñ§ä£x¨ì©O

 2006-01-21 22:23
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 Re: ¼x¨D°ª¤âÀ°¦£¤@¤U

¦b©_¼¯ª¾ÃÑ ¬Ý¨ìªº
http://tw.knowledge.yahoo.com/question/?qid=1306012703187

§Æ±æ ¹ï§A¦³À°§U!!

 2006-02-03 12:33
³X«È








 Re: ¼x¨D°ª¤âÀ°¦£¤@¤U

¤Þ¤å:

¼g¹D:
¦b©_¼¯ª¾ÃÑ ¬Ý¨ìªº
http://tw.knowledge.yahoo.com/question/?qid=1306012703187

§Æ±æ ¹ï§A¦³À°§U!!



¦ý¬O­n¬O©_¼Æ¸Ñ°Ú

¦pªG¬O¾ã¼Æ¸Ñ´N¤Ó¦nÃÒ£{

 2006-02-04 12:51
linian
Home away from home



µù¥U¤é: 2005-11-07
µoªí¼Æ: 292


 Re: ¼x¨D°ª¤âÀ°¦£¤@¤U

刦K
http://tw.knowledge.yahoo.com/question/?qid=1306012703187

¦]¬° n¡Ù3 ©Ò¥H ¨ú n = m+3
¨ú a = b = 2^k
¨º»ò (7a^2+b^2) = 8*(2^2k) = 2^(m+3)
§Y (2^2k) = (2^m) ¨º»ò·í m¬O°¸¼Æ®É¨ú k = m/2
¦]¦¹ a = b = 2^(m/2) ´N¬O¸Ñ
¦]¦¹ 7a^2+b^2=2^n ¹ï©Ò¦³¤j©ó3ªº©_¼Æ n ³£¦³µL²á¸Ñ a = b = 2^[(n-3)/2] !!!!

¦A¨Ó ¦Ò¼{ n ¬O°¸¼Æ±¡ªp
¥O n = 2( 2+ u) ¡Au¬O«D­tªº¾ã¼Æ
¦]¦¹ 2^n = 4^(2+u) ¤@©w¬O§¹¥þ¥­¤è¼Æ
¤S 7a^2+b^2=2^n ©Ò¥H
b^2 = 4^(2+u) - 7(a^2)
b^2= 16*[(4^u) - (a^2)] + (3a^2)
¨º¨ú a = 2^u «h a^2 = 4^u
§Y b = 3*(2^u)
¨º»ò §Ú­Ì±o¨ì µL²á¸Ñ a = (2^u) »P b = 3*(2^u)
«Ü®e©öÃÒ©ú 7(a^2) + (b^2) = 16*[2^2u] = (4^2)*(4^u)=4^(2+u)=2^n
¦]¦¹ 7a^2+b^2=2^n ¹ï©Ò¦³¤j©ó3ªº°¸¼Æ n ³£¦³µL²á¸Ñ a = (2^u) »P b = 3*(2^u)

¬G 7a^2+b^2=2^n ¹ï©Ò¦³¤j©ó 3 ªº n ³£¦³ ¥¿¾ã¼Æ¸Ñ (a¡Ab)
ÃÒ©ú§¹²¦##


_________________
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 2006-02-04 13:54­Ó¤H¸ê®Æ¶Ç°e Email µ¹ linian«ô³Xºô¯¸
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 Re: ¼x¨D°ª¤âÀ°¦£¤@¤U

¤Þ¤å:

linian ¼g¹D:
刦K
http://tw.knowledge.yahoo.com/question/?qid=1306012703187

¦]¬° n¡Ù3 ©Ò¥H ¨ú n = m+3
¨ú a = b = 2^k
¨º»ò (7a^2+b^2) = 8*(2^2k) = 2^(m+3)
§Y (2^2k) = (2^m) ¨º»ò·í m¬O°¸¼Æ®É¨ú k = m/2
¦]¦¹ a = b = 2^(m/2) ´N¬O¸Ñ
¦]¦¹ 7a^2+b^2=2^n ¹ï©Ò¦³¤j©ó3ªº©_¼Æ n ³£¦³µL²á¸Ñ a = b = 2^[(n-3)/2] !!!!

¦A¨Ó ¦Ò¼{ n ¬O°¸¼Æ±¡ªp
¥O n = 2( 2+ u) ¡Au¬O«D­tªº¾ã¼Æ
¦]¦¹ 2^n = 4^(2+u) ¤@©w¬O§¹¥þ¥­¤è¼Æ
¤S 7a^2+b^2=2^n ©Ò¥H
b^2 = 4^(2+u) - 7(a^2)
b^2= 16*[(4^u) - (a^2)] + (3a^2)
¨º¨ú a = 2^u «h a^2 = 4^u
§Y b = 3*(2^u)
¨º»ò §Ú­Ì±o¨ì µL²á¸Ñ a = (2^u) »P b = 3*(2^u)
«Ü®e©öÃÒ©ú 7(a^2) + (b^2) = 16*[2^2u] = (4^2)*(4^u)=4^(2+u)=2^n
¦]¦¹ 7a^2+b^2=2^n ¹ï©Ò¦³¤j©ó3ªº°¸¼Æ n ³£¦³µL²á¸Ñ a = (2^u) »P b = 3*(2^u)

¬G 7a^2+b^2=2^n ¹ï©Ò¦³¤j©ó 3 ªº n ³£¦³ ¥¿¾ã¼Æ¸Ñ (a¡Ab)
ÃÒ©ú§¹²¦##




¦ý¬O: a = b = 2^[(n-3)/2] ©M a = (2^u) »P b = 3*(2^u)
¬Ò«D©_¼Æ£{

 2006-02-04 14:14
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 Re: ¼x¨D°ª¤âÀ°¦£¤@¤U

¹ï£«
¨â£|¸Ñ³£¬O°¸¯À£z£°
¦pªG¬O¾ã¼Æ¸Ñ
of course
¥u­n¬O¤H
´X¥G³£·|ÃÒ

 2006-02-04 14:17
aa963854116
Home away from home



µù¥U¤é: 2006-01-06
µoªí¼Æ: 392
±q¥¼µo²{¤§89¸¹¬P®y

 À°¦£¤@¤U

³oÃD¬O§Ú°Ý£x(µoªíªÌ¤§¦P¾Ç)

°µ¨ìn=35³£¬O°ß¤@¸Ñ(ª`·N: ¬O©_¼Æ¸Ñ)

¦³¨S¦³¤H·|ÃÒ

 2006-02-04 15:17­Ó¤H¸ê®Æ
thing
Quite a regular



µù¥U¤é: 2005-10-13
µoªí¼Æ: 42


 Re: À°¦£¤@¤U

³o¬O¤×©Ô°ÝÃD
°ª±Ð¸Ì¦³¸Ñµª
pf:n=3,¨úa=1,b=1ÅãµM¦¨¥ß
³]n=k¦¨¥ß
2^k=7x^2+y^2
n=k+1
2^k+1=2*2^k=2(7x^2+y^2)=7(px+qy)^2+(rx+sy)^2
«h7p^2+r^2=14
7q^2+s^2=2
14pq+2rs=0
§Ú­Ì§Æ±æ¨úX=px+qy
Y=rx+sy
³£¬O©_¼Æ
¨Ï2^k+1=7X^2+Y^2
¸g¹L¤@µf­pºâ­Y¨ú
X=(x+y)/2 Y=(7x-y)/2 ---1
or
X*=(x-y)/2 Y*=(7x+y)/2---2
«h2^k+1=7X^2+Y^2¦¨¥ß
¤U­±ÃÒ©ú¦s¦b©_¼ÆX,Y
ÅãµM ³o¨â²Õ³£¬O¾ã¼Æ¸Ñ
X+Y=4x,X*+Y*=4x
X,Y X*,Y*
¦P©_°¸
¤SX+X*=x¬°©_
X,X*¤@©_¤@°¸
¬G¦b(X,Y) (X*,Y*) ¤¤
¥²¦³¤@²Õ¬°©_¼Æ
n=k+1®É¥ç¦¨¥ß
¬G©RÃD¦¨¥ß

 2006-02-04 23:35­Ó¤H¸ê®Æ
aa963854116
Home away from home



µù¥U¤é: 2006-01-06
µoªí¼Æ: 392
±q¥¼µo²{¤§89¸¹¬P®y

 Re: À°¦£¤@¤U

¤Þ¤å:

thing ¼g¹D:
³o¬O¤×©Ô°ÝÃD
°ª±Ð¸Ì¦³¸Ñµª
pf:n=3,¨úa=1,b=1ÅãµM¦¨¥ß
³]n=k¦¨¥ß
2^k=7x^2+y^2
n=k+1
2^k+1=2*2^k=2(7x^2+y^2)=7(px+qy)^2+(rx+sy)^2
«h7p^2+r^2=14
7q^2+s^2=2
14pq+2rs=0
§Ú­Ì§Æ±æ¨úX=px+qy
Y=rx+sy
³£¬O©_¼Æ
¨Ï2^k+1=7X^2+Y^2
¸g¹L¤@µf­pºâ­Y¨ú
X=(x+y)/2 Y=(7x-y)/2 ---1
or
X*=(x-y)/2 Y*=(7x+y)/2---2
«h2^k+1=7X^2+Y^2¦¨¥ß
¤U­±ÃÒ©ú¦s¦b©_¼ÆX,Y
ÅãµM ³o¨â²Õ³£¬O¾ã¼Æ¸Ñ
X+Y=4x,X*+Y*=4x
X,Y X*,Y*
¦P©_°¸
¤SX+X*=x¬°©_
X,X*¤@©_¤@°¸
¬G¦b(X,Y) (X*,Y*) ¤¤
¥²¦³¤@²Õ¬°©_¼Æ
n=k+1®É¥ç¦¨¥ß
¬G©RÃD¦¨¥ß



ÁÂÁÂthing£x¦^µª, §Ú¬ÝÀ´£{
aa963854116

 2006-02-05 13:19­Ó¤H¸ê®Æ


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