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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

Numbers with Even 1s in Binary

Print numbers whose binary form has even number of 1s.

AdvancedPhase 2 - Level 5: Logical Loop CombinationsExample 6 of 12
numbers-with-even-1s-in-binary.py
1# Print numbers
2print("Numbers with even 1s in binary:")
3for num in range(1, 21):
4    # Count 1s in binary
5    binary = bin(num)[2:]  # Remove '0b' prefix
6    count_ones = binary.count('1')
7    
8    if count_ones % 2 == 0:
9        print(f"{num} (binary: {binary})", end=" ")
10print()

Output

Numbers with even 1s in binary:
1 (binary: 1) 2 (binary: 10) 4 (binary: 100) ...

What's going on

Convert to binary and count 1s.

Key Concepts:

Use bin() to convert to binary
Count occurrences of '1'
Check if count is even

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