Fraction of even numbers in decimal expansion of $\pi$ and $e$.
23705
Does $\pi$ contain all possible number combinations?
63960
proving "e" irrational using convergent series
128415
Prove that $1<\frac{1}{1001}+\frac{1}{1002}+\frac{1}{1003}+\dots+\frac{1}{3001}<\frac43$
132928
Digits of $\pi$ forming primes?
157066
Do We Need the Digits of $\pi$?
2786
The staircase paradox, or why $\pi\ne4$
47044
Distribution of the digits of Pi
29517
How to find continued fraction of pi
40837
Why $e^{i(π/3)} \ne -1$?
57769
Are half of all numbers odd?
129236
Continued fraction for $\frac{1}{e-2}$
49444
Why isn't $e^{2\pi xi}=1$ true for all $x$?
50038
Proving that $e^\pi=e^{-\pi}$
69917
Integration of elementary rational fractions
28230
What bizarrities lurk within the decimal expansion of an irrational number?
65300
Why is $\pi$ irrational?
20135
Measure of  reals in $[0,1]$ which don't have $4$ in decimal expansion