12 Days of Christmas
415
Abundant Numbers
730
Arabic to Roman
628
Christmas Trees
597
CSS Colors
868
Diamonds
566
Divisors
933
Emirp Numbers
730
Evil Numbers
801
Factorial Factorisation
547
Fibonacci
935
Fizz Buzz
891
Happy Numbers
506
ISBN
610
Kaprekar Numbers
718
Leap Years
830
Levenshtein Distance
462
ln 2
788
Morse Decoder
481
Morse Encoder
452
Niven Numbers
938
Odious Numbers
783
Ordinal Numbers
699
Pangram Grep
771
Pascal’s Triangle
588
Pernicious Numbers
738
Prime Numbers
892
Quine
946
Rijndael S-box
793
Seven Segment
573
Sierpiński Triangle
131
Tongue-twisters
277
United States
630
π
823