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1. Print Primes 1 to N2. Sum of Primes in Range3. Count Composite Numbers4. Twin Primes5. Goldbach Conjecture (Even as Sum of Two Primes)6. Prime Factors of Number7. Sum of Prime Factors8. Numbers with Prime Number of Factors9. Semi-Prime Numbers10. Prime Triplets

Sum of Primes in Range

Calculate sum of all primes in range.

IntermediatePhase 6 - Category 3: Loop & Conditional MixExample 2 of 10
sum-of-primes-in-range.py
1# Helper function
2def is_prime(n):
3    if n < 2:
4        return False
5    for i in range(2, int(n ** 0.5) + 1):
6        if n % i == 0:
7            return False
8    return True
9

10# Take range
11a = int(input("Enter start: "))
12b = int(input("Enter end: "))
13

14# Sum primes
15total = 0
16for num in range(a, b + 1):
17    if is_prime(num):
18        total += num
19

20print(f"Sum of primes: {total}")

Output

Enter start: 1
Enter end: 10
Sum of primes: 17

What's going on

Find primes and accumulate sum.

Key Concepts:

Check each number for prime
Add to sum if prime
Return total sum

🔗Related Content

PreviousPrint Primes 1 to NNextCount Composite Numbers