12 Days of Christmas
605th11th
99 Bottles of Beer
Abundant Numbers
Christmas Trees
Collatz
Diamonds
390th
Divisors
Fibonacci
Fizz Buzz
1,231st55th
Happy Numbers
463rd
Intersection
Kolakoski Sequence
Leap Years
Look and Say
181st4th
Niven Numbers (Long)
Ordinal Numbers
Pascal’s Triangle
Prime Numbers
Quine
Roman to Arabic
Seven Segment
Sierpiński Triangle
φ
√2