12 Days of Christmas
900
Abundant Numbers
761
Arabic to Roman
881
Christmas Trees
686
CSS Colors
715
Diamonds
678
Divisors
984
Emirp Numbers
900
Evil Numbers
802
Factorial Factorisation
687
Fibonacci
935
Fizz Buzz
977
Gijswijt’s Sequence
807
Happy Numbers
653
ISBN
781
Kaprekar Numbers
795
Leap Years
831
Levenshtein Distance
591
ln 2
804
Morse Decoder
688
Morse Encoder
646
Niven Numbers
941
Odious Numbers
784
Ordinal Numbers
858
Pangram Grep
911
Pascal’s Triangle
634
Pernicious Numbers
738
Prime Numbers
892
Quine
944
Rijndael S-box
723
Seven Segment
785
Sierpiński Triangle
99
Tongue-twisters
498
United States
841
π
921