What are the special characteristics of a natural number X where any integral number Y divided by X yields a repeating number?
90009
Detecting that a fraction is a repeating decimal
59385
Are there number systems corresponding to higher cardinalities than the real numbers?
108748
Why there are real numbers with infinite digits, but no such natural numbers (or another reason why real numbers are uncountable)
121469
Proof of observations on natural numbers being expressed as differences of squares.
156242
As many even numbers as natural numbers.
124599
How do we know Euclid's sequence always generates a new prime?
52861
Natural Numbers and Well ordering
136885
Series of natural numbers which has all same digits
95702
Remarkable/unexpected rational numbers
24582
Is the set of sequences of natural numbers with trailing zeros countable?
9092
What is special about square numbers here?
85186
Basic demonstration concerning the natural logarithm...
136933
Which $n$ can be expressed as $x^2 − y^2$?
83037
Applying Zorn's Lemma to natural numbers
48051
Proof related to natural numbers
119278
The number $\frac{1}{\sqrt{5}}\left[\left(\frac{1+\sqrt{5}}{2}\right)^{n}-\left(\frac{1-\sqrt{5}}{2}\right)^n\right]$ is always an integer
40277
Given dividend and divisor, can we know the length of nonrepeating part and repeating part?