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A. Pongrácz

Debrecen, Hungary

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38
Integer solutions to $x^3=y^3+2y+1$?
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37
Optimal strategy for cutting a sausage?
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24
Super hard system of equations
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16
What is $\log(n+1)-\log(n)$?
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11
Smallest cube ending in $2017$
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11
Every finite commutative ring with no zero divisors contains a multiplicative identity?
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10
Simulating a fair coin toss using a biased coin in fixed number of tosses
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9
How to simplify $\int{\sqrt[4]{1-8{{x}^{2}}+8{{x}^{4}}-4x\sqrt{{{x}^{2}}-1}+8{{x}^{3}}\sqrt{{{x}^{2}}-1}}dx}$?
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8
Calculate, $f\bigg(\frac{1}{1997}\bigg)+f\bigg(\frac{2}{1997}\bigg)+f\bigg(\frac{3}{1997}\bigg)\ldots f\bigg(\frac{1996}{1997}\bigg)$
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7
Find all value of integers n for which the expression is a perfect square.
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7
Comparison of no. of abelian groups of order $p^r$ with that of order $q^r$
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6
How many homomorphisms from $\mathbb Z_4$ to $S_4$?
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6
Charged particles
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6
Existence of finitely presented group with exactly $k$ subgroups?
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6
Is the double series $\sum_{n,k\geq 1}\frac{1}{n^2+k^2}$ divergent?
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6
Is the domain of convergence of a sequence of measurable functions measurable? (general targets)
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6
Expected value: Is $E|X| = |E(X)|$?
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5
triangles in $\mathbb{R}^n$ with all vertices in $\mathbb{Q}^n$
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5
Whats the lowest multiple of $99$ that has digits of only $0, 1$, and $ 2$
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5
Does there exist a nearly immaculate group not of the form $C_{2^n}$?
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5
Is the image of a Null set is still a Null set under a differentiable function whose derivative is bounded?
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5
Compute $\lim_{n\to\infty}\frac{\tfrac{n}{1}+\tfrac{n-1}{2}+\dots+\tfrac{2}{n-1}+\tfrac{1}{n}}{\ln(n!)}$
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5
prove $f$ is bounded given $f(t^2+u)=tf(t)+f(u)$
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5
What is the probability that there will be no matching pairs of shoes in the sample?
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5
How many pairs $(p, m)$ exist, where $p$ is a prime and $m$ is an integer, such that $\frac{m^3-pm+1}{m^2+pm+2}$ is an integer.
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