## Paper/Pencil Problems

A place to share links to other websites and interesting articles
GenePeer
Posts: 112
Joined: Sat Apr 03, 2010 12:14 pm
Contact:

### Re: Paper/Pencil Problems

Problem 145 (View Problem), I think it's easier on paper than programming.

rayfil
Posts: 1400
Joined: Sun Mar 26, 2006 4:30 am
Contact:

### Re: Paper/Pencil Problems

When you assume something, you risk being wrong half the time.

browni3141
Posts: 18
Joined: Thu Jan 20, 2011 2:06 am

### Re: Paper/Pencil Problems

Problem 207 (view problem) is one of the easier ones on paper I think.

Susanne
Posts: 32
Joined: Sun Nov 08, 2009 7:39 am

### Re: Paper/Pencil Problems

Problem 68 (View Problem) certainly should be in the list.

zwuupeape
Posts: 189
Joined: Tue Jun 09, 2009 5:11 pm

### Re: Paper/Pencil Problems

Legendre made a table of the first million prime numbers on his own, and that led him to the conjecture that is now known as the prime number theorem. We are just lazy...

GenePeer
Posts: 112
Joined: Sat Apr 03, 2010 12:14 pm
Contact:

### Re: Paper/Pencil Problems

I prefer to think of it as him being a genius.

GenePeer
Posts: 112
Joined: Sat Apr 03, 2010 12:14 pm
Contact:

### Re: Paper/Pencil Problems

Problem 38 (View Problem) Don't know how I missed gamma's P/P solution, and yet it's the first post.
Problem 100 (View Problem) Had done it before I learnt how to solve pell's equation by hand.
Problem 147 (View Problem) Props to Eigenray & ke9tv
Problem 148 (View Problem)

edit: I'm level 4 now! Woot woot
Last edited by GenePeer on Mon May 09, 2011 1:09 am, edited 5 times in total.

cbrt74088
Posts: 2
Joined: Wed Mar 09, 2011 12:46 am

### Re: Paper/Pencil Problems

Problem 009 (View Problem) is easy too.
It's 2 equations with 3 unknowns.
I used excel to iterate through some numbers, but it's easily doable without a computer.

GenePeer
Posts: 112
Joined: Sat Apr 03, 2010 12:14 pm
Contact:

### Re: Paper/Pencil Problems

Problem 162 (View Problem) Treating the summation most people used as geometric series, solution can be found with just MS Calculator!

Problem 4 (View Problem) Just saw Begoner's solution on the first page.

bass_isa
Posts: 1
Joined: Sun May 08, 2011 10:31 pm

### Re: Paper/Pencil Problems

I did Problem 301 (View Problem) with pencil/paper

GenePeer
Posts: 112
Joined: Sat Apr 03, 2010 12:14 pm
Contact:

### Re: Paper/Pencil Problems

Problem 168 (View Problem)

Francky
Posts: 90
Joined: Sat May 07, 2011 2:49 pm
Location: South of France

### Re: Paper/Pencil Problems

Problem 45 (View Problem) and I'm very proud.
I can find the next one too.
Entia non sunt multiplicanda praeter necessitatem

GenePeer
Posts: 112
Joined: Sat Apr 03, 2010 12:14 pm
Contact:

### Re: Paper/Pencil Problems

Problem 175 (View Problem)
Problem 176 (View Problem)

idantlol
Posts: 16
Joined: Mon Jul 11, 2011 12:14 pm

### Re: Paper/Pencil Problems

If you're going to count 139 and 138 (although I personally would not have the patience to do them without a computer myself ), the solutions to 321,140 and 137 are pretty similar.

GenePeer
Posts: 112
Joined: Sat Apr 03, 2010 12:14 pm
Contact:

### Re: Paper/Pencil Problems

138 & 139 simplify to pell's equation which can be solved on paper. Your examples give pell-like equations but not doable without a computer as far as I can tell.

idantlol
Posts: 16
Joined: Mon Jul 11, 2011 12:14 pm

### Re: Paper/Pencil Problems

Perhaps I'm saying too much, I don't know. But they can all be solved with xxx can they not?
Last edited by idantlol on Tue Aug 30, 2011 10:09 am, edited 1 time in total.

hk
Posts: 10202
Joined: Sun Mar 26, 2006 9:34 am
Location: Haren, Netherlands

### Re: Paper/Pencil Problems

idantlol wrote:Perhaps I'm saying too much, I don't know. But they can all be solved with ...... can they not?
Yes, you are.
Solutions to the problems are not to be discussed in this forum.
Can the spoilers in the previous posts be removed, or do I have to do it?

GenePeer
Posts: 112
Joined: Sat Apr 03, 2010 12:14 pm
Contact:

### Re: Paper/Pencil Problems

Added. Sadly, I didn't get to read your suggestion. Would it be ok if you posted it on the Problem 321 (View Problem)? It's the only unarchived thread for those three.

Thanks.

idantlol
Posts: 16
Joined: Mon Jul 11, 2011 12:14 pm

### Re: Paper/Pencil Problems

Oky doke

GenePeer
Posts: 112
Joined: Sat Apr 03, 2010 12:14 pm
Contact:

### Re: Paper/Pencil Problems

That's how I solved the problem too. But to find "it", I had to use bruteforce like most did on the forum. Can you do find it with just paper/pencil?