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Pythagorean Plus One (Posted on 2004-05-17) |
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A "Pythagorean Plus One" triple can be defined as any three distinct integers a, b, c, such all three of these are one more than a perfect square, and also a times b equals c.
What is the lowest value of c possible?
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Submitted by Gamer
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Rating: 2.0000 (3 votes)
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Solution:
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(Hide)
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All the numbers need to be distinct, so 0 can't equal a, b, or c. The lowest other possibility is a=1, b=a+1=2, which results in a value of c=3. A way to prove that b can be a+1 is posted here:
(a^2+1)((a+1)^2+1)=
(a^2)(a^2+2a+1)+(a^2)+(a^2+2a+1)+1= (a^4+2a^3+a^2+a^2+a^2+a^2+2a+1)+1=
(a^4+ax^3+ax^2+ax+1)+1=
(a^2+a+1)^2+1. |
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