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## #1 2011-03-13 00:50:27

studymaths
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### Find the missing number

So I was clearing out my classroom yesterday and came across a cryptic number puzzle.  Unfortunately I couldn't find the solution and it's been so long I can't remember it.  Even google couldn't help me!

The puzzle is:

1, 13, 16, 61, ? , 217

Find the missing number.

Can anyone help, it's driving me mad!

## #2 2011-03-13 01:01:31

bobbym

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### Re: Find the missing number

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #3 2011-03-13 01:05:13

studymaths
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### Re: Find the missing number

Thanks, I can stop tearing my hair out now.  Maybe I'd have seen it if i'd bothered to write down the differences rather than working them out in my head.

## #4 2011-03-13 01:10:05

bobbym

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### Re: Find the missing number

Hi studymaths;

Keeping good, neat notes has been the hardest thing. Just mastering that will make your students successful.

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #5 2012-05-03 10:24:21

anonimnystefy
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### Re: Find the missing number

I wanted to ask you about that. Where do you keep your notes? It seems that you have in there everything that you have ever worked on on this forum.

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #6 2012-05-03 10:25:48

bobbym

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### Re: Find the missing number

I gloss in books.

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #7 2012-05-03 10:27:22

anonimnystefy
Real Member

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### Re: Find the missing number

Gloss?

Have you posted the problem yet?

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #8 2012-05-03 11:53:15

bobbym

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### Re: Find the missing number

Glossing is an old term.

Why are you not sleeping yet?

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #9 2012-05-03 11:57:39

anonimnystefy
Real Member

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### Re: Find the missing number

I am used to staying up late now.

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #10 2012-05-03 12:03:21

bobbym

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### Re: Find the missing number

I am used to staying up late now.

Oh boy!

I haven't got a problem yet to post.

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #11 2012-05-03 12:11:21

anonimnystefy
Real Member

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### Re: Find the missing number

But you said you were gonna post one.

The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

## #12 2012-05-03 17:07:37

bobbym

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### Re: Find the missing number

They do not come out of thin air. I have to find one or create it. What type of problem is this?

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.