Are there infinitely many emirps?
41277
Prime with digits reversed is prime?
86988
Cardinality of the Irrationals
78407
Are there infinitely-many numbers that are both square and triangular?
136279
Infinitely many primes $\equiv 3 \mod 4$
152946
how many distinct values does it have?
35691
$\mathbb Z[\sqrt 3]$ contains infinitely many units
38379
Showing that $e^z=z$ has infinitely many solutions
5313
Existence of how many sets is asserted by the axiom of choice in this case?
27540
A polynomial can not have infinite number of constant values
33737
Does $1.0000000000\cdots 1$ with an infinite number of $0$ in it exist?
137308
If an IVP does not enjoy uniqueness, then it possesses infinitely many solutions
94741
Are all infinities equal?
80188
There are infinitely many irreducible polynomials in $\Bbb{F}_p[X]$
99984
Are polynomials infinitely many times differentiable?
71108
Is there an integer $N>0$ such that $\varphi(n) = N$ has infinitely many solutions?
156006
Cardinality of set containing all infinite subsets of $\mathbb{Q}$
28148
Are there any simple ways to see that $e^z-z=0$ has infinitely many solutions?