## Composite nos

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• An observation I made (checked for the range 3-10000)suggests that ODD composite nos can be described as follows: - composite(odd)
Message 1 of 4 , Sep 1, 2003
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?

Navid
• ... Are you being serious? What do you mean? What about 225? Have you thought about this at all? So once you get past 121, there are no numbers divisible by 7
Message 2 of 4 , Sep 1, 2003
On Mon, Sep 01, 2003 at 11:04:21AM -0000, navid_altaf wrote:
>
> 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?

Are you being serious? What do you mean? What about 225? Have you
numbers divisible by 7 and 3? Or 5 and 7? Or 3, 5 and 7? What are you
on?

Andy
• Sorry 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
Message 3 of 4 , Sep 1, 2003
Sorry 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
• ... Umm well ok. Same response. What about 539? Or 275? Or 325? Or 455? Or 357? And so on, and so on.... Odd numbers are: - Divisible by one of 3,5 or 7, or -
Message 4 of 4 , Sep 1, 2003
> Sorry 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.

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