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theo92

  • 2 years ago

My calculation of primenumbers is nearly working out, only sometimes it gives a primenumber that is not a primenumber at all, like 5405, 5615, 6035 or even 95. I find it really weird and do not see why this happens... My Code is here: http://dpaste.com/1324943/ Thank you guys!

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  1. bwCA
    • 2 years ago
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    the % operator might help http://docs.python.org/2.7/library/stdtypes.html#numeric-types-int-float-long-complex strategically placed print statements can help alot - it shows you what is going on in your code

  2. e.mccormick
    • 2 years ago
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    Are you just trying to find the n\(^{th}\) prime? Because it also skips 2 and 3....

  3. e.mccormick
    • 2 years ago
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    And you forgot to reset your divisor when you find something is non-prime, so the test point is past 5 when it checks 95.

  4. e.mccormick
    • 2 years ago
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    Oh... one last thing, you are doing an import math... why?

  5. e.mccormick
    • 2 years ago
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    I made a fixed version. I suggest playing with mod, %, like bwCA says and resetting divisor to 3 on failures. If that does not do it, then look at the fixed version. http://dpaste.com/hold/1325399/

  6. e.mccormick
    • 2 years ago
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    This one is also based on yours, does not use %, and deals with another issue... the +2 after finding the last prime! http://dpaste.com/hold/1325422/

  7. bwCA
    • 2 years ago
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    @theo92 - i added some print statements to your code.

  8. theo92
    • 2 years ago
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    Thank you, with your advice i could fix the problem.

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