12 Days of Christmas
99 Bottles of Beer
Abundant Numbers
Christmas Trees
CSS Colors
Diamonds
Divisors
Emirp Numbers
Evil Numbers
Fibonacci
Fizz Buzz
Happy Numbers
Intersection
Leap Years
Leyland Numbers
Look and Say
Niven Numbers
Odious Numbers
Ordinal Numbers
Pangram Grep
Pascal’s Triangle
Pernicious Numbers
Prime Numbers
Quine
1st1st1st
Recamán
Rock-paper-scissors-Spock-lizard
Roman to Arabic
Rule 110
Vampire Numbers
π
τ
φ
√2
𝑒