Smallest positive integer $n$ s.t. f(n) = $n^2 + n + 41$ is composite?
55060
Prove that $n^2+n+41$ is prime for $n<40$
76977
Prove that $f(n)$ is the nearest integer to $\frac12(1+\sqrt2)^{n+1}$?
21986
What is the minimum value of $(1 + a_1)(1 + a_2). . .(1 + a_n)$?
132089
How do I prove/disprove that $F_n^2 + F_{n\pm 1}^2 = F_{2n\pm 1}$, where $F_n$ is the $n$th Fibonacci number?
102650
$\require{enclose}\enclose{horizontalstrike}{\rm Greatest}\!$ Least prime factor of $n$ is less than square root of $n$, proof
44857
Why the $(n+1)$th prime number cannot exceed the smallest prime divisor of $p_1\dotsc p_n + 1$
57736
Minimum value of $\left(a+\frac{1}{b}\right)^2+\left(b+\frac{1}{c}\right)^2+\left(c+\frac{1}{a}\right)^2$
144017
How to find the smallest $n$ such that $n^a\equiv 1 \pmod p$
63702
There is a prime between $n$ and $n^2$, without Bertrand
35553
If $n$ is composite, so is $2^n-1$
119524
For $n \in \mathbb{N}$ $\lfloor{\sqrt{n} + \sqrt{n+1}\rfloor} = \lfloor{\sqrt{4n+2}\rfloor}$
44076
Proving if $d_0$ is the smallest positive integer in $S$ then $d_0 = \gcd(a,b)$
51649
prove there is no smallest positive rational number
45144
Another way to write least prime factor.
148713
If $p\geq 5$ is a prime number, show that $p^2+2$ is composite.
143274
What is the smallest unknown natural number?
97659
Am I on the right track to proving this statement about composite function?