Examples of rational numbers with large denominators appearing unexpectedly.
95702
Remarkable/unexpected rational numbers
75503
Rationalizing a Denominator with Cube Roots
23164
Why are irrational numbers uncountable and rationals countable?
148035
Is it possible for a sequence of rational numbers to have a non rational limit?
53139
How to demonstrate that there is no all-prime generating polynomial with rational cofficents?
7672
Are there strange attractors whose coordinates are "almost integers"?
19254
How many rationals of the form $\large \frac{2^n+1}{n^2}$ are integers?
87410
Are there real numbers that are neither rational nor irrational?
48949
Solving a Diophantine equation with a large solution
19076
If a.b.c,d are rationals and x is irrational number, then prove that $\frac{ax+b}{cx+d}$ is usually a irrational number. When do exceptions occur?
15920
Derangements with repetitive numbers
73612
Is there a Non-prime Number that is Divisible only by Numbers Greater than its Square Root?
116822
Finding the next rational number
148310
Showing rational numbers are algebraic
37642
Why is $\pi$ irrational if it is represented as $C/D$?
138977
Infinitely many rational numbers between two different real numbers
127537
Is there any mathematical or physical situations that $1+2+3+\ldots\infty=-\frac{1}{12}$ shows itself?