12 Days of Christmas
659
Arabic to Roman
776
Christmas Trees
920
Diamonds
802
Divisors
950
Emirp Numbers
742
Evil Numbers
757
Fibonacci
963
Leap Years
934
Niven Numbers
806
Ordinal Numbers
794
Pangram Grep
Pascal’s Triangle
857
Pernicious Numbers
554
Prime Numbers
830
Quine
920
Roman to Arabic
719
Sierpiński Triangle
605