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50
Can't argue with success? Looking for “bad math” that “gets away with it”
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41
Prove that 16, 1156, 111556, 11115556, 1111155556… are squares.
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17
How to find the value of $\sin{\dfrac{\pi}{14}}+6\sin^2{\dfrac{\pi}{14}}-8\sin^4{\dfrac{\pi}{14}}$
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16
How to prove the sum of squares is minimum?
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14
Mystery about $\sum_{n\geqslant 1}2^{-n!}$
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12
How to show $p_n$ $\leq$ $2^{2^n}$?
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10
Show that $\operatorname{rank}(A+B) \leq \operatorname{rank}(A) + \operatorname{rank}(B)$
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10
Find the sum of p+q?
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9
Largest $k$ for which $a^k +b^k \leq c$
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8
why $\lim_{x\to-\infty}(\sin x+2)\ln(-x)=\infty$?
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7
Taylor series $\ln(\tan(x))-\ln(x)$ for point $0$
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7
Theorem about two real numbers 2
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7
Finding a Pythagorean triple $a^2 + b^2 = c^2$ with $a+b+c=40$
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7
How do you calculate the modulo of a really high number with a large power, with a really high mod number?
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6
Solving an Exponential Equation
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6
How to show that $\gcd(a,b) = ax+by \implies \gcd(x,y)=1$?
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6
given $y = a + bx + cx^2$ fits three given points, find and solve the matrix equation for the unknowns $a,b$, and $c$
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6
Fastest way to try all passwords
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6
Matrices with $A^3+B^3=C^3$
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6
Chess Board and Knights
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6
Solve $\frac{\tan^2x}{1+\tan^2x} = \sin^2x$
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6
Show that this function is one to one
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6
How to entertain a crowd with mathematics?
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5
Partition of a set
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5
Evaluate $\int \frac{x^{2}-2x+7}{\sqrt[3]{4x-1}}\mathrm dx$
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5
What is the probability that $X<Y$?
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5
How to solve $\max_{f}\int_{0}^{\infty}f\left(x\right)dx$ subject to $\int_{0}^{\infty}xf\left(x\right)dx=x_{0}$?
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5
Rewriting a function so it is in a form that can be easily integrated.
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5
How to determine the limit of this sequence?
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5
Solving the equation: $p^a (1-p)^b = q^a (1-q)^b$
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