- View SourceAn observation I made (checked for the range 3-10000)suggests

that ODD composite nos can be described as follows:

- composite(odd)< 121 : divisible by 3,5 or 7

- composite(odd)> 121 : will always be the product of a

prime no AND a no. indivisible by 3,5, or 7

Is it possible to prove this?

Any examples of where this does not hold?

Navid - View SourceOn Mon, Sep 01, 2003 at 11:04:21AM -0000, navid_altaf wrote:
>

Are you being serious? What do you mean? What about 225? Have you

> An observation I made (checked for the range 3-10000)suggests

> that ODD composite nos can be described as follows:

>

> - composite(odd)< 121 : divisible by 3,5 or 7

>

> - composite(odd)> 121 : will always be the product of a

> prime no AND a no. indivisible by 3,5, or 7

>

>

> Is it possible to prove this?

> Any examples of where this does not hold?

thought about this at all? So once you get past 121, there are no

numbers divisible by 7 and 3? Or 5 and 7? Or 3, 5 and 7? What are you

on?

Andy - View SourceSorry folks, obvious error in my previous message. Not quite

with it today. Take 2:

An observation I made suggests that ODD composite nos can be

described in one of two ways:

- composite(odd): divisible by 3,5 or 7

or

- composite(odd): product of a prime no AND a no. indivisible by

3,5 or 7.

Navid - View Source
> Sorry folks, obvious error in my previous message. Not quite

Umm well ok. Same response. What about 539? Or 275? Or 325? Or

> with it today. Take 2:

>

> An observation I made suggests that ODD composite nos can be

> described in one of two ways:

>

> - composite(odd): divisible by 3,5 or 7

>

> or

>

> - composite(odd): product of a prime no AND a no. indivisible by

> 3,5 or 7.

455? Or 357? And so on, and so on....

Odd numbers are:

- Divisible by one of 3,5 or 7,

or

- Divisible by none of 3,5 or 7.

And that's it. Will you please let go of this idea that 3,5,7 are

somehow more important? They're not, they're just small primes.

Andy