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**auyeungyat****Member**- Registered: 2013-09-23
- Posts: 22

You pick a number(3 numbers),multiply by 7,11,13,(example:123X7X11X13=123123)

How it comes?

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,503

hi auyeungyat

Welcome to the forum.

I have changed the {} into [] so that your answer is hidden.

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**mathaholic****Member**- From: Earth
- Registered: 2012-11-29
- Posts: 3,246

3x7x11x13

21x11x13

231x13

3,003

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

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**mathaholic****Member**- From: Earth
- Registered: 2012-11-29
- Posts: 3,246

If 1:

1x7x11x13

7x11x13

77x13

1,001 (just a third of my example above!)

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

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