100_percent's blog

Editorial didn’t help here [Closed]
By 100_percent, history, 6 weeks ago, In English

Could someone please explain how to solve this problem: Prime Number

It’s from an old contest and I haven’t been able to find a clearer explanation of the solution. Thank you and please do not ignore if you can solve it and explain.

EDIT: After 2 to 3 hours of painstakingly searching for a vivid explanation, I sat down to burst my brains out on the problem. Suffice to say, I am very satisfied and at peace with finding how to obtain the solution and why the solution works by myself after spending quite a lot of time. Below are shots of my notes for the problem. For anyone who needs it.

NB: I gave up on the problem and checked the editorial in reasonable time. I just wasn't satisfied with the explanation. I also found the problem interesting urging me to dig more. If there are any improvements, questions, mistakes or suggestions please comment below.

Solution

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6 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

gridnevvvit

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6 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

Don’t understand why the downvotes (as if I care) but I didn’t say the editorial wasn’t good. I just don’t understand it (probably skill issue) and would want a different perspective or a similar one but with different wording.

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5 weeks ago, # |
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My submission is pretty self explanatory

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Actually, I wanted to understand the underlying math and how to get to the solution. I have the understanding now. Thanks though for the efforts :)

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