Difference between revisions of "1992 OIM Problems/Problem 4"

Revision as of 23:48, 13 December 2023

Let $(a_n)$ and $(b_n)$ be two sequences of integers that verify the following conditions:

i. $a_0 = 0$ , $b_0 = 8$

ii. For all $n \geq 0$ , $a_{n+2}=2a_{n+1}-a_{n}+2$ , $b_{n+2}=2b_{n+1}-b_{n}$

iii. $a_{n}^{2}+b_{n}^{2}$ is a perfect square for all $n\ge 0$

Find at least two values of pair $(a_{1992},b_{1992})$ .

~translated into English by Tomas Diaz. ~orders@tomasdiaz.com

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Revision as of 23:47, 13 December 2023 (view source) Tomasdiaz (talk \| contribs) ← Older edit		Revision as of 23:48, 13 December 2023 (view source) Tomasdiaz (talk \| contribs) Newer edit →
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	iii. <math>a_{n}^{2}+b_{n}^{2}</math> is a perfect square for all <math>n\ge 0</math>		iii. <math>a_{n}^{2}+b_{n}^{2}</math> is a perfect square for all <math>n\ge 0</math>

−	Find at least two values of <math>(a_{1992},b_{1992})</math>.	+	Find at least two values of pair <math>(a_{1992},b_{1992})</math>.