12 Days of Christmas
906
Abundant Numbers
773
Arabic to Roman
905
Christmas Trees
697
CSS Colors
748
Diamonds
691
Divisors
1,000
Emirp Numbers
919
Evil Numbers
816
Factorial Factorisation
711
Fibonacci
947
Fizz Buzz
983
Gijswijt’s Sequence
839
Happy Numbers
667
ISBN
805
Kaprekar Numbers
826
Leap Years
843
Levenshtein Distance
612
ln 2
828
Morse Decoder
702
Morse Encoder
660
Niven Numbers
957
Odious Numbers
800
Ordinal Numbers
880
Pangram Grep
935
Pascal’s Triangle
651
Pernicious Numbers
755
Prime Numbers
909
Quine
969
Rijndael S-box
751
Seven Segment
804
Sierpiński Triangle
101
Tongue-twisters
501
United States
857
π
942