Puzzle for 24 Jun 2009
Find Smallest 3 digit prime number which has

Re: Puzzle for 24 Jun 2009
What does this mean : "Any combination of those digits are also prime" ??
Any 2digit, 3digit, 4digit or how many digit combination ?!? 
Re: Puzzle for 24 Jun 2009
1 3 7

Re: Puzzle for 24 Jun 2009
1 7 9

Re: Puzzle for 24 Jun 2009
here, 197, 971, 917 all prime numbers.
Is this you meant? Hope so. 
Re: Puzzle for 24 Jun 2009
Yes.
Any combination of digits I meant

Re: Puzzle for 24 Jun 2009
BTW how did you found the answer would also be interesting to hear.

Re: Puzzle for 24 Jun 2009
Shabbir: I would like to highlight something here.
As per the rules: Added 19th Jun 2009  You can post as many answers as you like, but only your last posted answer will be considered. Mridula posted multiple answers and you said that his first reply 137 is the right answer So... now what??? What say Saswat?? 
Re: Puzzle for 24 Jun 2009
hmmmmm !!! So I guess this goes down as one more question where we have no winner.

Re: Puzzle for 24 Jun 2009
Quote:
@shabbir Anyway, this question was INCORRECT. So, it should be canceled. (Just another reason) 137 and 173 are NOT the only 3digit combinations of 1, 3, and 7. Combinations like 371, 713 and 731 are composite. And how come the digit '1' is prime ?!? :crazy: These were the errors I had noticed and so I asked you, if we had to consider 2digit and 3digit combinations too. And then there was a power outage here :( for about an hour. Even if we were to consider only 2digit combinations ONLY, then also such a number is impossible 'cuz 2, 3, 5, 7 are the only prime digits and if we choose any 3 out of them, we will have to select 2 or 5 or both. But then any 2digit number of the form X2 or X5 (where X is any digit, in this case 3 or 7), is composite ! So, this question should NOT have the (invalid) 3rd requirement : "Any combination of those digits are also prime". 
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