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#1 |
May 2017
ITALY
52·19 Posts |
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a * b = N
if N mod 4 = 1 then 2 * N + 2 * a ^ 2 + ((b-a) / 2) ^ 2 = ((3 * a + b) / 2) ^ 2 now i found that in some cases (i don't know which ones) this is also true 2 * N + 2 * 1 ^ 2 + y ^ 2 - ((3 * a + b) / 2) ^ 2 = 0 So for example for the case N = 65 you would 2 * 65 + 2 * a ^ 2 + ((b-a) / 2) ^ 2 = ((3 * a + b) / 2) ^ 2 , a * b = 65 , 130 + 2 * 1 ^ 2 + y ^ 2 - ((3 * a + b) / 2) ^ 2 = 0 Could you help me: 1) When is this true? 2 * N + 2 * 1 ^ 2 + y ^ 2 - ((3 * a + b) / 2) ^ 2 = 0 2) How would you fix the system? |
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#2 |
Bamboozled!
"πΊππ·π·π"
May 2003
Down not across
101001100101102 Posts |
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#3 |
May 2017
ITALY
1DB16 Posts |
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#4 |
"Curtis"
Feb 2005
Riverside, CA
3·1,579 Posts |
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#5 |
If I May
"Chris Halsall"
Sep 2002
Barbados
253716 Posts |
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#6 |
6809 > 6502
"""""""""""""""""""
Aug 2003
101Γ103 Posts
3·3,163 Posts |
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#7 | |
Aug 2006
32×5×7×19 Posts |
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\(ab \equiv 1 \pmod4,\) so either \(a \equiv b \equiv 1 \pmod4\) or \(a \equiv b \equiv 3 \pmod4\).
Quote:
Yep, this checks out, both as an identity and with the relevant quantities as multiples of 4. Are you asking for which y this equality holds? |
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#8 |
May 2017
ITALY
1110110112 Posts |
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What characteristic must N have for that equality to be true
for example for N = 121 this 2 * 121 + 2 * 1 ^ 2 + y ^ 2- (22) ^ 2 = 0 it's not true that is, y is not integer Last fiddled with by Alberico Lepore on 2020-09-10 at 07:22 |
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#9 |
Undefined
"The unspeakable one"
Jun 2006
My evil lair
29×211 Posts |
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#10 | |
May 2017
ITALY
52×19 Posts |
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390644893234047643=4*K+3 390644893234047643*3=1171934679702142929=4*H+1 Now I need to understand what k values this system returns integer values a*b=1171934679702142929*(4*k+1) , 2*1171934679702142929*(4*k+1)+2*a^2+((b-a)/2)^2-z^2=0 , 2*1171934679702142929*(4*k+1)+2*1^2+y^2-z^2=0 Last fiddled with by Alberico Lepore on 2020-09-10 at 08:34 |
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#11 |
Undefined
"The unspeakable one"
Jun 2006
My evil lair
17E716 Posts |
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