Topic
1. Numbers with Even Digit Sum2. Count Numbers Divisible by 7 but Not 53. All Palindrome Numbers 1-5004. Numbers with Digit Sum Multiple of 35. Smallest & Largest Digit6. Numbers with Even 1s in Binary7. Print i*i Pattern8. Factorial of Each Number 1-N9. Sum of Odd & Even Digits Separately10. Sum with Continue (Skip 0)11. Sum of Squares of Even Numbers12. Count Primes in Range

Count Primes in Range

Count prime numbers between a and b.

AdvancedPhase 2 - Level 5: Logical Loop CombinationsExample 12 of 12
count-primes-in-range.py
1# Take range
2a = int(input("Enter start: "))
3b = int(input("Enter end: "))
4

5# Count primes
6count = 0
7for num in range(a, b + 1):
8    if num < 2:
9        continue
10    is_prime = True
11    for i in range(2, int(num ** 0.5) + 1):
12        if num % i == 0:
13            is_prime = False
14            break
15    if is_prime:
16        count += 1
17

18print(f"Primes in range: {count}")

Output

Enter start: 10
Enter end: 30
Primes in range: 6

What's going on

Check each number in range for primality.

Key Concepts:

Loop through range
Check each for prime
Count matches

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PreviousSum of Squares of Even Numbers