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Hardcore Maths Question

Algorithms

46 Posts 11 Posters 0 Views 1 Watching

J Judah Gabriel Himango

leppie wrote:

I wonder if its some kind of series...

It appears to be every 2520.

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R Raj Lal

Judah Himango wrote:

I kind of cheated though

well thats ok , and of course there are more numbers but the fun is when you deduce how to do it It's the journey, not the destination

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#35

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P Paul Conrad

Judah Himango wrote:

It appears to be every 2520.

It is. Modifying the your code that I modified and posted, shows this to be true :)

I'd like to help but I am too lazy to Google it for you.
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P Paul Conrad
There was a question of if there were more number, yes, there are. Here is a modification of your code that shows others :)

#include using namespace std;

int main()
{
int start = 1;
int divisor = 10;
while ( start <1000000 ) // Or whatevery you want in signed 32-bit range
{
while (divisor >= 2)
{
if (start % divisor == divisor - 1)
{
divisor--;
}
else
{
start++;
divisor = 10;
}
}
```
    cout<
```
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#37

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P Paul Conrad

leppie wrote:

So there are more than one of these. I wonder if its some kind of series...

Take a look at the modification of Judah's code that I posted. Your number is one of the numbers that come up :)

I'd like to help but I am too lazy to Google it for you.
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#38

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R Raj Lal

yes thats true there are many , but if you think it might take a day to get the solution , without any computer help, but its worth

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#39

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J Judah Gabriel Himango

yeah yeah :) Hey, I worked for it at least. :) *edit* oooh, misunderstood you there leppie. I though you were chiding me for solving it with code rather than brain. :) Yes, there are other numbers, it appears every 2520 iteration matches the criteria.

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L leppie

Judah Himango wrote:

I kind of cheated.

He did say "find a number" :) So there are more than one of these. I wonder if its some kind of series...

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J Judah Gabriel Himango
Provided I've understood the question correctly, I think I've solved it. I kind of cheated though; I wrote a C# program that solves this:
```
        int start = 1;
        int divisor = 10;
        while (divisor >= 2)
        {
            if (start % divisor == divisor - 1)
            {
                divisor--;
            }
            else
            {
                start++;
                divisor = 10;
            }
        }
```
Soon as that loop exits, you've got your number, which happens to be 2519.
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L leppie

2701439 last 4 digits by deduction, rest trial and error guess with 3/9 rule. :)

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L leppie

Here's a wild guess: 123456789 ? [edit] ok I got the 9 bit :p [edit] -- modified at 18:37 Wednesday 26th July, 2006
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A Andrew Bleakley

It's not a mexican is it ?
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R Raj Lal

Ok lets me be the first to ask a maths question Find a number which 1. divided by 10 gives a remainder 9 2. divided by 9 gives remainder 8 --- --- so on till divided by 2 gives a remainder 1 Any one ?

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