12 Days of Christmas
415
Abundant Numbers
730
Arabic to Roman
628
Christmas Trees
597
CSS Colors
870
Diamonds
566
Divisors
933
Emirp Numbers
730
Evil Numbers
802
Factorial Factorisation
546
Fibonacci
935
Fizz Buzz
891
Gijswijt’s Sequence
666
Happy Numbers
507
ISBN
610
Kaprekar Numbers
720
Leap Years
831
Levenshtein Distance
463
ln 2
789
Morse Decoder
481
Morse Encoder
453
Niven Numbers
939
Odious Numbers
784
Ordinal Numbers
699
Pangram Grep
772
Pascal’s Triangle
588
Pernicious Numbers
738
Prime Numbers
892
Quine
944
Rijndael S-box
794
Seven Segment
574
Sierpiński Triangle
131
Tongue-twisters
277
United States
615
π
824