12 Days of Christmas
247th
Abundant Numbers
399th
Arabic to Roman
92nd
Catalan Numbers
190th
Christmas Trees
109th
Diamonds
147th
Divisors
420th
Emirp Numbers
286th
Evil Numbers
207th1,110th
Fibonacci
212th
Fizz Buzz
84th
Foo Fizz Buzz Bar
1st
ISBN
140th
Leap Years
537th
Niven Numbers
510th
Odious Numbers
155th
Ordinal Numbers
243rd
Pascal’s Triangle
227th
Prime Numbers
793rd
Prime Numbers (Long)
435th
Quine
92nd
Rock-paper-scissors-Spock-lizard
72nd
Seven Segment
67th
Van Eck Sequence
140th