how to find sum of logarithm values

Question

I just started learning Python 3 and I have the following problem to solve:

"Write a program that computes the sum of the logarithms of all the primes from 1 to some number n, and print out the sum of the logs of the primes.

a. input: integer n

b. output: the sum of log(1),log(2),log(3),...,log(n) (the base of log is 10)"

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score -1 · Answer 1 · answered Mar 07 '20 at 08:57

There is a log10 function in the math module, so you don't need to figure out how to calculate the log yourself. So you would do something like:

import math

def is_prime(x):
    # Write a function that returns whether x is prime

def log_sum(n):
    # Return the sum of all logs for primes smaller than n
    log_total = 0
    for i in range(1, n+1):
        if is_prime(i):
            log_total += math.log10(i)
    return log_total

how to find sum of logarithm values

1 Answers1