Conjectures that are false for very large numbers
5574
Conjectures that have been disproved with extremely large counterexamples?
9819
prove/disprove Big-Oh
51278
Theorems with an extraordinary exception or a small number of sporadic exceptions
156242
As many even numbers as natural numbers.
126015
Elementary number theory in sets
87356
Are there any known uncountable transfinite increasing sequences of real numbers?
27448
The Collatz conjecture algorithm applied to negative integers
104012
Some details about 'Collatz Conjecture'?
10905
Avoiding negative integers in proof of Fundamental Theorem of Arithmetic
134352
The number of possible factorizations of a positive integer.
146439
Is every sufficiently large positive integer of the form $ab + ac + bc + 1$?
51129
Proving $n^\epsilon > \log(n)$ for sufficiently large $n$
7672
Are there strange attractors whose coordinates are "almost integers"?
71159
Example of Erdos-Szekeres bound being tight
112491
Finding counterexamples for infinite series.
110167
A conjecture with connection to the $abc$-conjecture
95890
GCD algorithms for a large integers