12 Days of Christmas
896
Arabic to Roman
852
CSS Colors
905
Leap Years
816807933
Morse Decoder
Niven Numbers
746892928
Odious Numbers
598
Ordinal Numbers
935
Poker
Prime Numbers
522
Rock-paper-scissors-Spock-lizard
772
Roman to Arabic
674
Seven Segment
639
Spelling Numbers
United States
π
654