12 Days of Christmas
896
Arabic to Roman
861
CSS Colors
905
Leap Years
816807933
Morse Decoder
Niven Numbers
745892928
Odious Numbers
597
Ordinal Numbers
935
Poker
Prime Numbers
522
Rock-paper-scissors-Spock-lizard
777
Roman to Arabic
674
Seven Segment
652
Spelling Numbers
United States
π
653