Disprove $m!=100x^2+20x$ using an estimation for factorial.
19588
$n!+1$ being a perfect square
46661
A binomial inequality with factorial fractions: $\left(1+\frac{1}{n}\right)^n<\frac{1}{0!}+\frac{1}{1!}+\frac{1}{2!}+...+\frac{1}{n!}$
91786
Proving and disproving $\exists b,c\in \mathbb R$ such that $f(x)=\frac a2x^2+bx+c $
20224
Calculating factorial of large numbers in C
48657
Solving factorial equations
139426
Proving $ \binom n 0 ^2 + \binom n 1 ^2 + \dots + \binom n n ^2 = \binom { 2n} n $ without induction
28489
Estimating partial sums $\sum_{n = 1}^m \frac{1}{\sqrt{n}}$
20618
Expressing a factorial as difference of powers: $\sum_{r=0}^{n}\binom{n}{r}(-1)^r(l-r)^n=n!$?
130223
Proving a special case of the binomial theorem: $\sum^{k}_{m=0}\binom{k}{m} = 2^k$
93944
How to calculate what this power series converges against? (double factorials)
128415
Prove that $1<\frac{1}{1001}+\frac{1}{1002}+\frac{1}{1003}+\dots+\frac{1}{3001}<\frac43$
151636
Fast way to calculate n! mod m where m is prime?
120913
How would you write a non-recursive algorithm to calculate factorials?
104158
$\frac 00=$ ? Why It is un answerable?
89413
Can there be only one extension to the factorial?
81267
A simple doubt in number theory problem.
56463
Factorial of a non-integer number