172 reputation
9
bio website hiddewieringa.nl
location Netherlands
age 20
visits member for 2 years, 8 months
seen Jun 29 at 10:08

I am a PHP software developer, who likes scripting and solving Project Euler problems using Python (and sometimes C++ and Java).

Fan of coffee, computers and cycling.


Jun
29
comment How to solve: $0 = -\sin \space 3x \cdot3, \left({\pi\over 12}, {7\pi \over12}\right)$
@Matt You're very right, my mistake.
Jun
28
comment How to solve: $0 = -\sin \space 3x \cdot3, \left({\pi\over 12}, {7\pi \over12}\right)$
I think he means the values $c$ for which $f'(c) = 0$ in the interval $[\frac{\pi}{12},\frac{7\pi}{12}]$, from Roll's Theorem.
Aug
15
comment Solving $x^2 \cdot y^2 + x^2 + y^2 = c^2$ with $x$, $y$, $c \in \mathbb{Z}^+$
I have read your answer, and I agree a lot. I am letting my mind go over it while I am sleeping, that always helps. The reduction of the range of $x$ is good, it should help. I hope though that something in the range of $10^{11}$ is computable.
Aug
15
comment Solving $x^2 \cdot y^2 + x^2 + y^2 = c^2$ with $x$, $y$, $c \in \mathbb{Z}^+$
I really don't understand what you are trying to do in your solutions. Maybe I am not mathematically educated enough. If it is really a solution to my problem, it would be nice if you could explain a little what you are doing.
Aug
15
comment Solving $x^2 \cdot y^2 + x^2 + y^2 = c^2$ with $x$, $y$, $c \in \mathbb{Z}^+$
@MarkBennet Thanks for the comment, I found that out already. I still require 25 minutes of computing power to calculate all the $(x, y)$ for $c \le 10^6$. $10^{10}$ is just not possible brute force.
Aug
15
asked Solving $x^2 \cdot y^2 + x^2 + y^2 = c^2$ with $x$, $y$, $c \in \mathbb{Z}^+$
Aug
11
awarded  Scholar
Aug
11
comment Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744} $
That is a great answer, it gave me the push in the back to find the answer. Thanks a lot for your time.
Aug
11
accepted Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744} $
Aug
11
comment Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744} $
@MarkBennet I got that part covered. Thanks so far for all the input, I'm coming somewhere.
Aug
11
comment Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744} $
Very right, this is what I am calculating. Editing the question.
Aug
11
revised Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744} $
added 171 characters in body
Aug
11
asked Solving $\phi (n) < (n-1) \cdot \frac{15499}{94744} $
Mar
18
awarded  Citizen Patrol
Mar
14
revised How do we get the result of the summation $\sum\limits_{k=1}^n k \cdot 2^k$?
Added LaTeX to make the question more readable
Mar
14
suggested suggested edit on How do we get the result of the summation $\sum\limits_{k=1}^n k \cdot 2^k$?
Mar
14
awarded  Quorum
Mar
5
comment Properties of lines in the Pixel + Zoom geometry
What have you tried?
Feb
28
comment How to solve $\frac{dp}{dt}=t^2p-p+t^2-1$
$\int (t^2 -1)dt = \frac{1}{3} t^3 - t$. Typo probably.
Feb
20
comment Regular Expressions - alphabet $(a, b, c)$
Is this maybe a StackOverflow question? Please show what you need it for, and what you have tried so far.