Paper/Pencil Problems

[GenePeer]

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

[rayfil]

How about adding Problem 241 (View Problem) to the list.

[browni3141]

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

[Susanne]

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

[zwuupeape]

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]

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

[GenePeer]

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

[cbrt74088]

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]

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]

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

[GenePeer]

Problem 168 (View Problem)

[Francky]

Problem 45 (View Problem) and I'm very proud.
I can find the next one too.

[GenePeer]

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

[idantlol]

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]

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]

Perhaps I'm saying too much, I don't know. But they can all be solved with xxx can they not?

[hk]

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]

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]

Oky doke

[GenePeer]

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?