Solving $2 \times 5^n - 1 = m^2$ in natural numbers
119109
Integer solutions to $ n^2 + 1 = 2 \times 5^m$
41354
Binomial-coefficients if, k, m, n natural numbers and k \leq n the result of
106965
How to algebraically prove $\binom{n+m}{2} = nm + \binom{n}{2} + \binom{m}{2}$?
116277
real values of $x$ in $\sqrt{5-x} = 5-x^2$.
79071
Solve the recurrence $T(n) = 2T(n-1) + n$
35864
Playing with numbers form $1$ to $n^2$ in an $n\times n$ grid
131941
Solve quadratic congruences.
60041
Number of real roots of $3^x+4^x=2^x+5^x$ with proof
20834
Integer solutions to $c=a^2-b^2$
156873
Solve the equation $\binom{2n+1}{n+2} = \binom{2n+1}{5} $
108035
solving diophantine equations using congruences
33996
Proving that $\gcd(2^m - 1, 2^n - 1) = 2^{\gcd(m,n )} - 1$
34192
Solve $x^{5} \equiv 2$ mod $221\ $ [Taking modular $k$'th roots if unique]
156266
Solving $|x-2| + |x-5|=3$
136933
Which $n$ can be expressed as $x^2 − y^2$?
144765
Solving $\sqrt{x+5} = x - 1$
13789
solve $T(n)=T(n-1)+T(\frac{n}{2})+n$