12 Days of Christmas
900
Abundant Numbers
760
Arabic to Roman
878
Christmas Trees
685
CSS Colors
719
Diamonds
677
Divisors
984
Emirp Numbers
899
Evil Numbers
801
Factorial Factorisation
683
Fibonacci
934
Fizz Buzz
976
Happy Numbers
652
ISBN
779
Kaprekar Numbers
778
Leap Years
831
Levenshtein Distance
590
Morse Decoder
687
Morse Encoder
645
Niven Numbers
941
Odious Numbers
783
Ordinal Numbers
857
Pangram Grep
909
Pascal’s Triangle
634
Pernicious Numbers
737
Prime Numbers
891
Quine
946
Rijndael S-box
720
Seven Segment
785
Sierpiński Triangle
102
Tongue-twisters
498
United States
915
π
920