## Search found 18 matches

Sun Feb 04, 2018 5:48 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 360
Replies: 5
Views: 3585

### Re: Problem 360

Are there [snip] points for $radius =10^{10}$?
Fri Feb 02, 2018 1:51 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 360
Replies: 5
Views: 3585

### Re: Problem 360

I googled and fixed my calculations. I got S(45)=34518

And number of points is 510.
Thu Feb 01, 2018 4:29 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 360
Replies: 5
Views: 3585

### Re: Problem 360

Does the number of all integer points on the surface of the sphere with radius 45 equal 1098?
Thu Aug 03, 2017 11:57 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 317
Replies: 39
Views: 20221

### Re: Problem 317

v6ph1 wrote: Wed Aug 02, 2017 8:01 pm Suggesting a specific precise approximation will gave the others too much hints.
v6ph1, I understand your answer now, not to give the others to much hints.
Wed Aug 02, 2017 12:14 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 317
Replies: 39
Views: 20221

### Re: Problem 317

Hi japp, My initial question in the forum "Clarifications on Project Euler Problems" was What approximate value of $\pi$ should be used? The answer must be a number, for example $3.14$. v6ph1's initial answer was You need 4 decimals in your solution. - So if you append the next digit of pi...
Tue Aug 01, 2017 9:48 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 317
Replies: 39
Views: 20221

### Re: Problem 317

What approximate value of $\pi$ should be used? You need 4 decimals in your solution. - So if you append the next digit of pi, the solution should not change at all. I solved the problem. :) v6ph1, Your suggestion to use 5 decimals in calculations gives an incorrect result . The difference from the...
Sun Jul 30, 2017 1:23 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 317
Replies: 39
Views: 20221

### Re: Problem 317

OK. Cylinder is very rough maximum approximation. The real volume is much less than the volume of the cylinder. I agree with you, v6ph1. My results are still not accepted :( What angle increment $1^o$ or $0.5^o$ should I use in my calculations? This is the important question because an answer to it ...
Sat Jul 29, 2017 12:32 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 317
Replies: 39
Views: 20221

### Re: Problem 317

formula $h = Y_{max}=H+\frac{V_0^2}{2g}$

exact result is $120.3874m$
Fri Jul 28, 2017 4:55 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 317
Replies: 39
Views: 20221

### Re: Problem 317

I submit many answers but they were not accepted. So I did approximation of covered area as cylinder with height $h=Ymax=120m$ and radius $r=X_{max}=100m$ $Volume_{cylinder}=\pi*r^2*h$ Volume of cylinder . So the answer can not exceed $3,769,911.1843 m^3$ Could someone PM me to verify my approach to...
Fri Jul 14, 2017 9:46 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 317
Replies: 39
Views: 20221

### Re: Problem 317

What approximate value of $\pi$ should be used?
Fri Jul 14, 2017 9:40 pm
Forum: News, Suggestions, and FAQ
Topic: Suggestion to add a favorite problems page.
Replies: 0
Views: 2603

### Suggestion to add a favorite problems page.

I suggest to add favorite/tried problems page(s) to projecteuler.net
Fri Feb 24, 2017 2:47 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 058
Replies: 32
Views: 13948

### Re: Problem 058

Thank you mdean. My code correctly calculates for 7 but failed for sstein wrote: I keep getting a wrong answer on this one and its annoying me because it seems to be really simple. First drops below 50% at side length 11. Diagonal count: 21. Prime Count 10. Cor: 121 First drops below 40% at side len...
Thu Feb 23, 2017 3:31 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 058
Replies: 32
Views: 13948

### Re: Problem 058

I modified code from Problem 28 (Number spiral diagonals) to go counterclockwise and applied to primes.
I have the answer where a side is below 700 and it is not accepted. Any hints to verify what I am doing wrong in my algorithm?
Thanks.
Thu Feb 09, 2017 3:54 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 066
Replies: 34
Views: 15550

### Re: Problem 066

Thank you, sjhillier, for encouraging me to learn.
The problem solved !!
Mon Feb 06, 2017 2:26 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 066
Replies: 34
Views: 15550

### Re: Problem 066

Well, if you look up http://en.wikipedia.org/wiki/Diophantine_equation and look at "Examples of Diophantine Equations" it's there, isn't it? (third example). What it boils down to is that people are supposed to do this bit of research by themselves and find out what it is about. The meta ...
Sat Jan 14, 2017 11:55 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 549
Replies: 19
Views: 8244

### Re: Problem 549

It is impossible to solve this problem by calculating the most factorials directly. My approach to find the number of common divisors for the smallest divisor and factorial. I used Legendre's Theorem to do the trick for factorials. My program runs quickly and correctly for n = 100. I improved proces...
Fri Jan 13, 2017 8:09 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 087
Replies: 8
Views: 3826

### Re: Problem 087

Thank you very much !
Fri Jan 13, 2017 4:58 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 087
Replies: 8
Views: 3826

### Re: Problem 087

my method is have three place values x, y, z. x^2 + y^3 + z^4. I increment z by primes until max then increment y and start over with the z's. Etc.... Similar to counting 001, 002, ... , 009, 010, 011, ... I can not figure out why this is producing errors. I keep getting 1139575?? I get the same re...