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don't worry you are not alone

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I have 2 answered. Go me! \o/

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I saw this about a week ago and I'm up to 8 or 9...impressive right? xD

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dude rubix just use my conjectures
they're pretty much correct here I'll even repost them again 
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I got #72 in about two seconds. Only took one line of coding in Mathematica haha. I'll look into the most recent problem when I have more time.

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omfg
Unfortunately had to do some manual work (it COULD be automated but it just wasn't worth the headache) 
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gj
right now I'm workin on uh, 351 I believe 
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okay I made a small improvement on the speed of computation but it's not anything significant. what the hell did you do

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yeeeeessssshhhhh

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Reincarnate
I have been lurking on this thread for a few days. I wanted to see if I could pick your brain a bit on problem 355. I have been getting close by implementing FFR4EVA_00's method of [a_2,a_3,a_5...a_p]. It is basically bumping the exponent of all primes < N But alas, the answer is incorrect. Did you use a method like this? Or did you go down a different path? 
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You have to do a lot more with that because the method for checking optimization possibilities from there is much too broad and will take forever.
If you try to optimize that you'll be doing well over 10^(300+) calculations, which your program will not finish within the lifespan of the universe. 
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holy crap pari/gp lololol
this thing rules lololololololol ****in hell 
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Yes, the four of us that solved it all did the last part manually.

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Solved 190 with Excel... <3

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I am working on the < 100 problems. My Advanced Algorithms teacher is giving a massive amount of extra credit if you can show you solved one of them. I am using the 3 conjectures and the way FFREVA started to get a pretty good start, but I am still falling short. 
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Undergraduate sophomore. Took a basic course in programming and that's it.
Honestly, I just love Project Euler problems because you don't need to be super crazy good at programming to solve them, as long as you have a good sense with math. My code for problem 355 (excluding the last part which was manual) was completely done with the most basic programming concepts and nothing else. For loops, while loops, a small handful of dedicated functions, and that's it. 
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There is no literal pen and pad needed  just some manual fudging to the program
EDIT: Solved all the trianglenumbered problems Almost got 354 solved... just one piece missing but I'm too tired to fiddle with it tonight. night yall 
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Took a stab at a few more problems tonight:
Problem 28 MATLAB is a little cheap with respect to creating a spiral function  it already has one built in, so I utilized it to find my solution. Also, most of my codes for Project Euler are scripts, but for some reason I decided to actually make this one a function. No real reason. Problem 29 This one turned out to be pretty easy. Just used a nested for loop and then eliminated all of the elements I didn't want in my vectors (i.e. repeating values). I also came up with brute force solutions to Problems 7173, which actually work with small sample sizes, but MATLAB is pretty horrible with big numbers as well as large volumes of numbers, so it takes a crap when I run it and says it doesn't have enough memory. I bought an 8GB flashdrive online today that's ReadyBoost enabled, so hopefully when I get it I can run my programs. 
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solved 108 in notepad
solved 110 in a spreadsheet 
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Is cursing allowed on this forum? Because #$@# problem 355.
I am not a math guy, I can normally get these using CS algorithms, but there just isn't a solid method I can come up with to solve this. Did your solutions work for all the examples? e.g. Co(10),Co(30) & Co(100) 
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In the meanwhile, I solved a few more problems :) 
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Thanks again. 
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I turned back.

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that's nowhere near the answer to 355, if that's what you're referring to

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then yes, yes they do 
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level 1 get!

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Problem 356 will be accessible in 1 day, 9 hours, 5 minutes (Sat, 29 Oct 2011, 08:00 [America/New_York])
Current date/time on server: Fri, 28 Oct 2011, 03:55 Hahaha I'm excited!! 
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So Much Bullshit

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(Quote post to avoid clicking so many buttons)
I don't like how this thread essentially gives out major hints for the last problems. Can we stop giving hints and/or wrong attempts if a couple of posts are not enough? hondaracer600, no offense but could you stop asking people to feed you with direct hints?? It defeats the whole purpose of project euler. 
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BAM!!

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Nice leonid. I'm stuck on it haha.
EDIT: On another note: Yesssss!! 
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Problems like 356 are annoying because they're battles against the precision of your programming language... in huge ways
aka you need some other method to solve it because rounding errors will be the death of you no matter what. 
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leonid, you're a beast

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This was the code for my "naive" attempt (note: does not work because it requires more precision than we have access to, doing it this way. Still works great for smaller powers, though):

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Got #205 with pencil and paper. Took forever but at least I didn't have to sleep through my english class hahaha.
EDIT: Just got #53 with pencil and paper :) 
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The problems that I have found to be the most rewarding to solve with pencil/paper rather than coding are: ("*" following the number indicates a high difficulty, "#" following a number represents a fairly tedious problem in terms of manual work)
6, 9, 26*, 28, 29#, 33, 39, 69, 108, 138*# I have obviously not looked at every problem between 1 and 108, but when I find more problems that can be done with pencil/paper I'll edit this. 
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Join #euler in irc.chatspike.net

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Do you know the definition of triangle numbered problem?

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1, 3, 6, 10, 15, 21, etc. Also, got #216 and #218 (o: Thinking about #241 now. 
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I've been cranking down hard on some of the easier problems (I'm still stuck on a few of the 300's that I find interesting)  just did 216 myself and pretty much bruteforced it (lame).

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EDIT: Got #179 just now. 
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stuck on 126 ffffuuuu
nvm got it 
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Pumped out a few more today... 137 was a bit of a challenge, but the solution is an interesting one. I'm only on page 4/8 of total problems (when arranging them by # solved) and the questions are definitely getting tougher. Problems 338's been out since May 2011 and it still hasn't reached 100 solvers yet. 344 looks beastly, too.
Hit level 7, going to bed. 
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I tried, but because I can't do math for the life of me, I ragequit.

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Just solved p357. Could've solved it faster but I was being dumb... oh well.

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Got 357 as well. I should try thinking of more efficient ways of solving it.

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This looks cool, I might start working on these when I have time.

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has anyone solved problem 44 and if so

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goddamnit

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Stuck on 152, which is silly because it should be easy 
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Just did number 15. I thought it was a little too easy; there wasn't even any programming needed to do this problem.

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Solved 349  posted my solution in the thread (check if out if you get the chance  it has a nice pretty text output, haha)

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Yeah the earlier problems are kinda stupid simple sometimes, but only because they're the early problems.

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level 7 !! \o/

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I still don't have 356 or 152 :<

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Got 358 \o/

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saaaaaaame, what a ffffffffuuu problem

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We need more people to be in on this  come join us in chat!
irc.chatspike.net room Euler 
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