Excel in math, science, and engineering

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Number Theory Level 2

Find the number of positive integer pairs \((a,b)\) that satisfy the equation \(a^{2} + a + 1 = b^{2}\).

Now try the generalized version.

0 1 2 3 4 There are infinitely many solutions

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations,
examples, and problems from the community.

Used and loved by 4 million people

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

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by Brian Charlesworth

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