Abundant Numbers
721
Arabic to Roman
449
Christmas Trees
607
Diamonds
471
Divisors
871
Emirp Numbers
519
Evil Numbers
800
Fibonacci
947
Fizz Buzz
898
Happy Numbers
511
Leap Years
827
Leyland Numbers
756
Niven Numbers
759
Odious Numbers
800
Ordinal Numbers
647
Pangram Grep
656
Pascal’s Triangle
676
Pernicious Numbers
702
Prime Numbers
645
Quine
969
√2
628