12 Days of Christmas
16th
Abundant Numbers
51st
37th
Arabic to Roman
15th
Divisors
1st
1st
Emirp Numbers
275th
77th
Evil Numbers
384th
58th
Fibonacci
178th
7th
Fizz Buzz
54th
1st
Happy Numbers
169th
24th
Leap Years
213th
47th
Look and Say
93rd
8th
Niven Numbers
187th
28th
Odious Numbers
287th
50th
Pangram Grep
25th
Pernicious Numbers
309th
58th
Prime Numbers
148th
Quine
1st107th67th22nd78th
Recamán
207th
18th
Roman to Arabic
40th
π
26th