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**Primenumbers****Member**- Registered: 2013-01-22
- Posts: 137

Using a prime number, multiply it by 2.

Separate it into 2 numbers separated by 10x.

Multiply one of them by 10 and add it to the other no.

You should now have another prime but you may need to divide it by 2 until odd.

Example:

13 X 2 = 26

Split into 23 and 3

3 X 10 = 30 plus 23 =53

23 X 10 = 230 plus 3 = 233

**"Time not important. Only life important."*** - The Fifth Element 1997*

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**Primenumbers****Member**- Registered: 2013-01-22
- Posts: 137

Don't know what happened there then. It worked for all the ones I tried.

**"Time not important. Only life important."*** - The Fifth Element 1997*

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**mathaholic****Member**- From: Earth
- Registered: 2012-11-29
- Posts: 3,251

Sorry to say, but I'm kind of confused...

Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate

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**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Confused about what?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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