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23 Dec 2004, 04:37
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Folks,
Is there a well-tested way to check if a large number like 73211 is odd and prime?Based on the number,I was able to determine that it was not divisble by the following numbers:
2-The last digit of 73211 is not 2
3 --As the sum of the digits of 73211 add to 5
5 -- As the last digit is not 0 nor 5
++++
But it was divisble by 7 in the following fashion:
7 -- 73211- [70000(7*10000) - 2800(7*400) - 411(7*137)]
+++++
Thus the above verifies that it is odd but nor prime number.
Is this the only way to check this?Is there a shorter method?[/b]
Is there a well-tested way to check if a large number like 73211 is odd and prime?Based on the number,I was able to determine that it was not divisble by the following numbers:
2-The last digit of 73211 is not 2
3 --As the sum of the digits of 73211 add to 5
5 -- As the last digit is not 0 nor 5
++++
But it was divisble by 7 in the following fashion:
7 -- 73211- [70000(7*10000) - 2800(7*400) - 411(7*137)]
+++++
Thus the above verifies that it is odd but nor prime number.
Is this the only way to check this?Is there a shorter method?[/b]
Archived Topic
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24 Dec 2004, 14:25
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I think you did a pretty good job of checking. I mean, you know because it's an odd number that it's not divisible by 4 or 6, so 7 is the likely one to check.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
