Python: Compute the sum of first n given prime numbers
Python Basic - 1: Exercise-52 with Solution
Write a Python program to compute the sum of first n given prime numbers.
Input:
n ( n ≤ 10000). Input 0 to exit the program.
Input a number (n≤10000) to compute the sum:(0 to exit)
25
Sum of first 25 prime numbers:
1060
Pictorial Presentation:

Sample Solution:
Python Code:
MAX = 105000
print("Input a number (n≤10000) to compute the sum:(0 to exit)")
is_prime = [True for _ in range(MAX)]
is_prime[0] = is_prime[1] = False
for i in range(2, int(MAX ** (1 / 2)) + 1):
if is_prime[i]:
for j in range(i ** 2, MAX, i):
is_prime[j] = False
primes = [i for i in range(MAX) if is_prime[i]]
while True:
n = int(input())
if not n:
break
print("Sum of first",n,"prime numbers:")
print(sum(primes[:n]))
Sample Output:
Input a number (n≤10000) to compute the sum:(0 to exit) 25 Sum of first 25 prime numbers: 1060
Flowchart:

Python Code Editor:
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Previous: Write a Python program to find the difference between the largest integer and the smallest integer which are created by 8 numbers from 0 to 9. The number that can be rearranged shall start with 0 as in 00135668.
Next: Write a Python program that accept a even number (>=4, Goldbach number) from the user and create a combinations that express the given number as a sum of two prime numbers. Print the number of combinations.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
Python: Tips of the Day
What is the difference between Python's list methods append and extend?
append: Appends object at the end.
x = [1, 2, 3] x.append([4, 5]) print (x)
Output:
[1, 2, 3, [4, 5]]
extend: Extends list by appending elements from the iterable.
x = [1, 2, 3] x.extend([4, 5]) print (x)
Output:
[1, 2, 3, 4, 5]
Ref: https://bit.ly/2AZ6ZFq
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