12 Days of Christmas
870
99 Bottles of Beer
724
Abundant Numbers
768
Christmas Trees
681
Collatz
879
Divisors
885
Emirp Numbers
569
Evil Numbers
784
Fibonacci
909334
Fizz Buzz
808
Happy Numbers
694
Morse Decoder
464
Niven Numbers
859
Odious Numbers
781
Pangram Grep
Pascal’s Triangle
632
Pernicious Numbers
721
Prime Numbers
665
Quine
962945
Recamán
845
Roman to Arabic
618
Seven Segment
683
Sierpiński Triangle
666
Spelling Numbers
476
United States