12 Days of Christmas
415
Abundant Numbers
730
Arabic to Roman
627
Christmas Trees
596
CSS Colors
868
Diamonds
565
Divisors
933
Emirp Numbers
730
Evil Numbers
801
Factorial Factorisation
546
Fibonacci
934
Fizz Buzz
891
Happy Numbers
506
ISBN
609
Kaprekar Numbers
718
Leap Years
830
Levenshtein Distance
462
ln 2
787
Morse Decoder
481
Morse Encoder
452
Niven Numbers
938
Odious Numbers
783
Ordinal Numbers
698
Pangram Grep
771
Pascal’s Triangle
587
Pernicious Numbers
738
Prime Numbers
892
Quine
946
Rijndael S-box
793
Seven Segment
573
Sierpiński Triangle
131
Tongue-twisters
280
United States
630
π
823