Any positive integer greater than $11$ is a nonnegative linear combination of $5$ and $4$. New Solution
36757
I can't determine the maximum natural number which is unable to be represented as $17\times x+23\times y$
146439
Is every sufficiently large positive integer of the form $ab + ac + bc + 1$?
100072
Can we add an uncountable number of positive elements, and can this sum be finite?
104603
Integer program in which at least one of three inequalities holds
119046
Expressing a positive integer as a sum of positive integers
149071
Let $d$ be any positive integer not equal to $2, 5,$ or $ 13$ , then $\exists a, b \in \{2, 5, 13, d\}$ such that $ab − 1$ is not a perfect square?
144571
A conjecture including binomial coefficients
129824
For what $a \in \Bbb R$ does $\neg(3a>21\implies a \leq 5)$ hold?
134570
Using Inclusion/Exclusion to solve $x_1+x_2+x_3=15$ with $x_1,x_2\leq 5$ and $x_3\leq 7$ for non negative integers $x_1,x_2,x_3$
60615
Product of $5$ consecutive integers cannot be perfect square
16660
Prove that any positive number has an $n$th root
23427
How to prove there are no more positive integers that are products of 2 and 3 consecutive numbers?
94209
Prove by contradiction that every integer greater than 11 is a sum of two composite numbers
63651
If $(a,b)=1$ then there exist positive integers $x$ and $y$ s.t $ax+by=1$.
29084
Largest integer that can't be represented as a non-negative linear combination of $m, n = mn - m - n$? Why?
56574
For any integer $a,b$ let $N_{a,b}$ denote the number of positive integer $x<1000$ satisfying $x= a( mod\;27)$ and $x=b(mod\;37)$. Then
91451
find all positive integer $m,n$