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Lambda function for calculating sum of primes


By : Tom
Date : September 15 2020, 07:00 AM
it fixes the issue 1. first error: "TypeError: 'generator' object is not callable"
this error raise because you pass to filter build-in method a generator, you "cover" the lambda method with parentheses:
code :
filter((lambda n: n%y != 0 for y in range(2,n)), range(2,n+1))
filter(lambda n: n%y != 0 for y in range(2,n), range(2,n+1))
lambda n: n%y != 0 for y in range(2,n)
lambda n: all(n%y != 0 for y in range(2,n))
sum=0
n_prime_sum = 0
n = int(input())

n_prime_sum = 0
n_prime_sum = sum(list(filter(lambda n: all(n%y != 0 for y in range(2,n)), range(2,n+1))))
n_prime_sum
# n = 10
17
# original code by David Eppstein, UC Irvine, 28 Feb 2002
# with comments by Eli Bendersky, https://stackoverflow.com/a/568618

def gen_primes(n):
    """Much more efficient prime generation, the Sieve of Eratosthenes"""

    D = {}

    q = 2   # The running integer that's checked for primeness

    while q <= n:
        if q not in D:
            # q is a new prime.
            # Yield it and mark its first multiple that isn't
            # already marked in previous iterations
            # 
            yield q
            D[q * q] = [q]
        else:
            # q is composite. D[q] is the list of primes that
            # divide it. Since we've reached q, we no longer
            # need it in the map, but we'll mark the next 
            # multiples of its witnesses to prepare for larger
            # numbers
            for p in D[q]:
                D.setdefault(p + q, []).append(p)
            del D[q]

        q += 1

n = int(input())
n_prime_sum = sum(gen_primes(n))
print(n_prime_sum)
# n = 10
17


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How do I use BigInterger In my code for calculating primes?


By : test user
Date : March 29 2020, 07:55 AM
it helps some times Do you really need this? Having numbers bigger than can be handled by long means you want to test numbers bigger than 9223372036854775807. If your for-loop can test a hundred million divisions per second, it will still take it 2923 years to determine if that number is prime - and longer for larger numbers, of course.
A common optimization is to only test divisions up to sqrt(num). If you haven't found anything then, the number is prime.

Program Calculating The Logs of Primes


By : Daniel Branco
Date : March 29 2020, 07:55 AM
it fixes the issue Your second list doesn't only contain the logs of primes, it contains the logs of all integers between 2 and lp[500].

Calculating primes from 1 to n -- Crash


By : Alexey Zaslavsky
Date : March 29 2020, 07:55 AM
around this issue I've writen some code in C that calculates all the prime numbers from 1 to n (n is input from user). , Your 'i' and 'x' both start from 0. So when you do

Lua - Calculating Primes from 1 to n


By : ChosenWell
Date : March 29 2020, 07:55 AM
around this issue The loop prints out a number if isPrime is true, but isPrime gets set to false when you check the value 4, and nothing ever sets it to true again.

Problem with calculating Primes within a given Range in C++


By : Toby Jones
Date : March 29 2020, 07:55 AM
Hope that helps Im trying to create a program that does various math operations, and i wanted to start with calculating prime numbers within a given range. However, when i try to execute the code, it just returns exit status -1. What is wrong with the program and how do i fix it? , this loop should start from 2 because :
code :
for (int c = 2; c < num; c++) {
    if (num % c == 0) {
        num_of_factors++;
    }
}
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