- Leap Year Birthday
- Prime Number
- Palindrome
- Reverse of a Number
- Sum of Digit of a number
- Product of digits of a number
- Armstrong
- Swap 2 Numbers using third Variable
- Swap 2 Numbers without using third Variable
- Find all Prime number till N
- Find Fibonacci series till N
- Happy Number
- Special 2-digit Number
- Magic Number
- Factorial of a number
- Factorial of a Number Using Recursion
- Sum of Natural Number using recursion
- HCF of 2 Numbers using recursion
- Ugly Number
- Factors of a Number
- Perfect Square Number
- Fibonacci series using Recursion
- Automorphic number
- Perfect number
- Special number
- Deserium Number
- First 10 fibonacci series