Gottfried Helms
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 1d answered Longest known sequence of identical consecutive Collatz sequence lengths? Apr10 answered Given $\log 2$ and $\log 3$, compute $\log 120$ Apr1 answered Find all solutions $a,\ b\in \mathbb{ N}$ to the equation $2^a = b^ 2 − 5$ Mar27 answered Cesàro means of divergent series Mar16 answered Example for $\dfrac{p_1p_2-1}{p_1+p_2}$ being odd natural number . Mar15 answered Finding eigenvalues using triangulars Mar6 answered Is Collatz' conjecture the only stable solution of its type? Mar2 answered Understanding the Power Iterative Method to find eigenvalues Feb26 answered $n^2+n+1$ is not prime if $n$ is a perfect square $>1$ Feb26 answered Proving $\frac{n^n}{e^{n-1}} 2$. Feb25 answered If $a\leq (b + c)/2$ with $a,b,c>0$, why $a^2\leq (b^2 + c^2)/2$? Feb25 answered For which values of $a$, $b$ and $c$, if $a + b = c$, then $\frac{1}{a} + \frac{1}{b} = \frac{1}{c}$? Feb25 answered For which values of $a$, $b$ and $c$, if $a + b = c$, then $\frac{1}{a} + \frac{1}{b} = \frac{1}{c}$? Feb23 answered In the Collatz function, why does $2^k-1$ reach $3^k-1$ after $2k$ steps, and could it be used to find divergent trajectories? Feb22 answered Is anything known about the size of the smallest number with stopping time $n$ Feb9 answered Repeated operations on $(a,b)$ Feb2 answered Program to find closest function to fit arbitrary data Feb2 answered Improvement IMO 1988 $f(f(n))=n+1987$ Jan28 answered Collatz conjecture: Largest number in sequence with starting number n Jan27 answered “Orthogonal” Rectangular Matrix