Interesting question regarding proof for a number to be composite.
68068
For any integer n greater than 1, $4^n+n^4$ is never a prime number.
138409
Proof of infinitely many primes, clarification
129693
An interesting problem with "decomposing" natural numbers.
116970
On the number divisors of a number
107990
Does there exist an integer $x$ satisfying the following congruences?
57281
Is Bezout's lemma enough to confirm the GCD of a number.
145519
Prove that for any natural number $n>1$, we have $(2n)!<(n(n+1))^n$
154822
Properties of the composition law $a @ b= ab + b + a$ on the real numbers
146867
Combinatorial Proof Of A Number Theory Theorem--Confusion
111037
Consider numbers of the type $n=2^m+1$. Prove that such an n is prime only if $n=F_K$ for some $ k \in N$, where $F_k$ is a Fermat Prime.
80229
How to prove this curiosity that has to do with cubes of certain numbers?
45460
Proof verification of a number theory problem involving sequences.
96027
Prove that if $a+b+c$ divides $abc$, then $a+b+c$ must be composite.
149241
What is the maximum number of consecutive composite numbers possible?
68824
Show that $\frac{(3^{77}-1)}{2}$ is odd and composite
140140
An identity which applies to all of the natural numbers
67208
Can we say that there exist an integer $n$ such $A+nB$ invertible?