12 Days of Christmas
490th
99 Bottles of Beer
136th74th
Abundant Numbers
205th
Abundant Numbers (Long)
158th
Arithmetic Numbers
117th
Catalan Numbers
240th
Christmas Trees
319th
Collatz
312th
Divisors
261st1st
Emirp Numbers
207th
Emirp Numbers (Long)
78th
Evil Numbers
396th
Evil Numbers (Long)
308th
Farey Sequence
45th103rd
Fizz Buzz
58th
Foo Fizz Buzz Bar
1st
Fractions
181st
Happy Numbers
340th
Happy Numbers (Long)
202nd
ISBN
340th
Kolakoski Sequence
243rd
Leap Years
368th
Lucky Tickets
81st
Niven Numbers
142nd
Niven Numbers (Long)
114th
Number Spiral
186th
Pangram Grep
60th
Pascal’s Triangle
1st
Pernicious Numbers
261st
Pernicious Numbers (Long)
157th
Prime Numbers
154th
Prime Numbers (Long)
50th
Quine
72nd
Reverse Polish Notation
95th
Rule 110
50th194th
Sierpiński Triangle
333rd
Tongue-twisters
373rd
Vampire Numbers
227th
Van Eck Sequence
96th
π
394th6th