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Diophantine equations

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Pythagorean triple
three positive integers, the squares of two of which sum to the square of the third
Diophantine equation
polynomial equation with integer solutions
Bézout's identity
formula relating two numbers and their greatest common divisor
Pell's equation
mathematical equation, specifically a kind of Diophantine equation
Catalan's conjecture
theorem about consecutive powers
Kaprekar number
non-negative integer, the representation of whose square in that base can be split into two parts that add up to the original number again
Euler's sum of powers conjecture
disproved mathematical conjecture
The Fermat method
A proof by contradiction used to show that a statement cannot be true for all numbers. If a statement is true for one number, it will also be true for a smaller number, up to infinity, leading to a contradiction and disproving the original statement.
Brocard's problem
the Diophantine problem of finding an integer, whose factorial plus one is a perfect square
Archimedes' cattle problem
a problem in number theory with a very large solution, attributed to Archimedes
Erdős–Straus conjecture
unproven statement in number theory
Beal's conjecture
conjecture in number theory
Markov number
an integer x, y, or z that can solve the Markov equation x^2 + y^2 + z^2 = 3xyz
Fermat–Catalan conjecture
conjecture
Hilbert's tenth problem
Mathematics problem
Ramanujan–Nagell equation
the Diophantine equation 2ⁿ−7=𝑥²
sums of three cubes
the mathematical problem of characterizing which integers are representable as sums of three cubes of integers
equation xʸ=yˣ
exponential function
Chakravala method
cyclic algorithm to solve indeterminate quadratic equations
Vieta jumping
proof technique
coin problem
problem in number theory
Hasse principle
principle that an integer equation can be solved by piecing together modular solutions
Fermat's right triangle theorem
non-existence proof in number theory, the only complete proof left by Pierre de Fermat
Jacobi–Madden equation
diophantine equation attributed to Jacobi and Madden
lonely runner conjecture
number-theoretic conjecture that states that 𝑘 people running around a circular track with distinct speeds will each be, at some point, separated by ¹⁄ₖ from every other runner
Pythagorean quadruple
four integers where the sum of the squares of three equal the square of the fourth
Tijdeman's theorem
theorem
Goormaghtigh conjecture
conjecture
Legendre's theorem
theorem giving conditions for existence of solutions to the Diophantine equation ax²+by²+cz²=0
Eisenstein triple
set of integers, the lengths of the sides of a triangle with a 60° angle
Birch's theorem
statement about the representability of zero by odd degree forms
tree of primitive Pythagorean triples
data tree in which each node branches to three subsequent nodes with the infinite set of all nodes giving all (and only) primitive Pythagorean triples without duplication
Diophantine m-tuple
tuple of numbers (a₁, a₂, …) such that aᵢaⱼ+1 is a perfect square for every i<j
Diophantine set
solution of some Diophantine equation
cannonball problem
number theory problem
Thue equation
type of equation with integer coefficients
Mordell curve
type of elliptic curve