12 Days of Christmas
523rd
99 Bottles of Beer
138th94th
Abundant Numbers
223rd
Abundant Numbers (Long)
174th
Arithmetic Numbers
134th
Catalan Numbers
264th
Christmas Trees
353rd
Collatz
339th
Divisors
273rd1st
Emirp Numbers
220th
Emirp Numbers (Long)
91st
Evil Numbers
424th
Evil Numbers (Long)
338th
Farey Sequence
50th122nd
Fizz Buzz
69th
Foo Fizz Buzz Bar
1st
Fractions
201st
Happy Numbers
358th
Happy Numbers (Long)
216th
ISBN
364th
Kolakoski Sequence
262nd
Leap Years
395th
Lucky Tickets
90th
Niven Numbers
160th
Niven Numbers (Long)
127th
Number Spiral
205th
Pangram Grep
66th
Pascal’s Triangle
1st
Pernicious Numbers
284th
Pernicious Numbers (Long)
173rd
Prime Numbers
180th
Prime Numbers (Long)
65th
Quine
84th
Reverse Polish Notation
109th
Rule 110
53rd206th
Sierpiński Triangle
351st
Tongue-twisters
391st
Vampire Numbers
239th
Van Eck Sequence
107th
π
420th6th