12 Days of Christmas
Abundant Numbers
Abundant Numbers (Long)
Arithmetic Numbers
Arrows
Card Number Validation
Catalan Numbers
Collatz
Divisors
2,691st385th270th
Emirp Numbers
Evil Numbers
Evil Numbers (Long)
Farey Sequence
Fibonacci
1,987th1,012th3,051st
Fizz Buzz
Foo Fizz Buzz Bar
Fractions
Happy Numbers
Intersection
Kolakoski Sequence
Leap Years
Leyland Numbers
ln 2
Look and Say
Niven Numbers
Niven Numbers (Long)
Odious Numbers
Odious Numbers (Long)
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Prime Numbers
1,216th671st769th
Prime Numbers (Long)
Quine
Recamán
Van Eck Sequence
Zeckendorf Representation
φ
√2
𝑒