Factorial formula problem
90447
Dividing factorials is always integer
113628
Where M is a matrix calculate a formula for M^n
123144
Formula : (Exact) Sum of $1^1+2^2+3^3+..+n^n$ (modulo $10^m$) with relatively small $m$
117758
Number of zeroes at end of factorial
153111
factoring a quadratic equation
20611
Inverse of a factorial
129381
Modular equation problem
68481
Finite Summation of Fractional Factorial Series
158124
Sum of all the positive integers problem
142401
Where's the problem in this equation? Resulting in $4 = 5$
80155
Binomial coefficient problem
48446
Summation involving a factorial: $1 + \sum_{j=1}^{n} j!j$
68235
Is there a way to solve for an unknown in a factorial?
155150
Division of Factorials [binomal coefficients are integers]
93617
Sum of the product of two combinations
100566
Ramanujan's approximation to factorial
3798
Finding formula for sum $S_n = \sum_{i=1}^n i(i-1)$