P251
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Cardano Triplets

ℹ️Published on Saturday, 20th June 2009, 09:00 am; Solved by 1573;
Difficulty rating: 70%

A triplet of positive integers $(a, b, c)$ is called a Cardano Triplet if it satisfies the condition:

$$\sqrt[3]{a + b \sqrt{c} } + \sqrt[3]{a - b \sqrt{c} } = 1$$

For example, $(2,1,5)$ is a Cardano Triplet.

There exist $149$ Cardano Triplets for which $a + b + c \le 1000$.

Find how many Cardano Triplets exist such that $a + b + c \le 110\,000\,000$.



Soluzione

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