12 Days of Christmas
331st
Arabic to Roman
193rd
Divisors
472nd
Emirp Numbers
156th
Evil Numbers
441st
Fibonacci
180th595th809th127th226th91st121st227th2,110th137th274th
Fizz Buzz
1,324th
Happy Numbers
191st
Leap Years
168th
114th
Morse Decoder
91st
Morse Encoder
90th
Niven Numbers
354th
Odious Numbers
341st
Pernicious Numbers
208th
Prime Numbers
461st
Roman to Arabic
119th
Seven Segment
97th