Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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#1 2013-09-23 22:36:45

auyeungyat
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How it's coming?

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

 

#2 2013-09-23 22:51:10

bob bundy
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Re: How it's coming?

hi auyeungyat

Welcome to the forum.

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

Bob


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

#3 2013-09-27 19:50:03

mathaholic
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Re: How it's coming?

3x7x11x13

21x11x13

231x13

3,003


246 pages on Prime Numbers Wiki (+1)
 

#4 2013-09-28 14:42:41

mathaholic
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Re: How it's coming?

If 1:

1x7x11x13

7x11x13

77x13

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


246 pages on Prime Numbers Wiki (+1)
 

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