12 Days of Christmas
415
Abundant Numbers
729
Arabic to Roman
626
Christmas Trees
596
CSS Colors
867
Diamonds
565
Divisors
932
Emirp Numbers
730
Evil Numbers
801
Factorial Factorisation
545
Fibonacci
934
Fizz Buzz
891
Happy Numbers
506
ISBN
609
Kaprekar Numbers
673
Leap Years
830
Levenshtein Distance
462
Morse Decoder
480
Morse Encoder
452
Niven Numbers
938
Odious Numbers
783
Ordinal Numbers
698
Pangram Grep
771
Pascal’s Triangle
587
Pernicious Numbers
737
Prime Numbers
891
Quine
946
Rijndael S-box
792
Seven Segment
573
Sierpiński Triangle
131
Tongue-twisters
280
United States
652
π
823