12 Days of Christmas
Abundant Numbers
2,988th
brainfuck
Catalan Numbers
Christmas Trees
Collatz
Cubes
Diamonds
Divisors
4,132nd
Emirp Numbers
Evil Numbers
3,666th2,984th
Fibonacci
6,008th3,500th956th6,143rd963rd7,479th2,820th
Fizz Buzz
Fractions
1,424th1,252nd
Happy Numbers
2,041st
Happy Numbers (Long)
Leap Years
Leyland Numbers
Look and Say
Niven Numbers
Odious Numbers
3,020th
Pascal’s Triangle
Pernicious Numbers
2,214th
Prime Numbers
3,847th3,046th1,785th3,630th
Quine
Recamán
Reverse Polish Notation
Roman to Arabic
Rule 110
Sierpiński Triangle
Smith Numbers
Sudoku
Sudoku (Fill-in)
Van Eck Sequence
√2