12 Days of Christmas
78699 Bottles of Beer
808Abundant Numbers
984Christmas Trees
859Cubes
718Diamonds
853Divisors
1,000Emirp Numbers
652Evil Numbers
905Fibonacci
957Fizz Buzz
621Happy Numbers
733Intersection
946Kolakoski Constant
497Kolakoski Sequence
619Leap Years
738Leyland Numbers
866Look and Say
773Morse Decoder
351Morse Encoder
432Niven Numbers
1,000Odious Numbers
929Pascal’s Triangle
851Pernicious Numbers
925Prime Numbers
891Recamán
686Seven Segment
624Tongue-twisters
712United States
497Vampire Numbers
548λ
522π
108τ
107φ
108√2
108𝑒
576