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Not especially famous, long-open problems which anyone can understand

A single paper everyone should read? [closed]

Are there any very hard unknots?

Favorite popular math book [closed]

Modern Mathematical Achievements Accessible to Undergraduates

Sophisticated treatments of topics in school mathematics

Elementary results with p-adic numbers

Two (probably) equal real numbers which are not proved to be equal?

$x^4+y^4$ powerful for relatively prime $x,y$

Continuous relations?

What is the effect of adding 1/2 to a continued fraction?

Does this knot invariant distinguish trefoil chiralities?

What (fun) results in graph theory should undergraduates learn?

Unexpected behavior involving √2 and parity

Avoiding multiples of $p$

Felix Klein on mean value theorem and infinitesimals

What is the state of the art for algorithmic knot simplification?

Does 53 diverge to infinity in this Collatz-like sequence?

Proofs that inspire and teach

Can we get good rational approximations in all residue classes?

Applications of pattern-free continued fractions

2-adic Logarithm and Resistance of n-dimensional Cube

Sums of digits again

What are the truly 'global methods' in number theory?

Are there $p$-adic modular forms for non-congruence subgroups?

Explicit isomorphism for quaternion algebras over $\mathbb{Q}$?

q-analog of $(d/dx) \binom{x}{k}$?

Proto-Euclidean algorithm

Rational approximation to a set of reals

Moduli interpretation of Hecke operators on Shimura curves