Abundant Numbers
Abundant Numbers (Long)
Arithmetic Numbers
Catalan Numbers
Collatz
Divisors
3,790th
1,762nd
Evil Numbers
Evil Numbers (Long)
Fibonacci
Fizz Buzz
2,179th
657th
Foo Fizz Buzz Bar
Happy Numbers
Happy Numbers (Long)
Leap Years
Leyland Numbers
Niven Numbers
Niven Numbers (Long)
Odious Numbers
Odious Numbers (Long)
Pascal’s Triangle
Pernicious Numbers
Prime Numbers
Prime Numbers (Long)
Recamán
Smith Numbers
Sudoku
Van Eck Sequence