Prime Numbers

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But a paranoid hashtable can t assume a good hash function so should use a prime number of buckets Similarly a paranoid hash function should use a largeish prime constant to reduce

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The nth prime is approximately n log n and can never be larger than 2 n prevprime n ith 1 Return the largest prime smaller than n nextprime n Return the ith

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A number is only prime if it is not divisible by other prime numbers that are up to the value of its square root Other than that you might consider using the probabilistic version of

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For example if you want to check whether the number 9 is prime or not you will loop all numbers from 2 to 8 and check if they can divide 9 So in your for loop the number 5

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All prime numbers other than 2 3 are of the form 6n 1 All composite numbers have prime factors This algorithm leverages those two facts to reduce the number of checks

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I have started learning C language I wrote this program to find all prime numbers between the given range but I am unable to get the expected output Can anyone tell me

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I was having issues in printing a series of prime numbers from one to hundred I can t figure our what s wrong with my code Here s what I wrote it prints all the odd numbers instead of primes

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There is an interesting way to generate prime numbers without any function or iterative process while based on sequence generation Basically a 2 max sequence is

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The above example doesn t generate prime numbers but tests them You could adapt the same optimizations to your code One of the more efficient algorithms I ve found