12 Days of Christmas
53rd
Abundant Numbers
162nd
Abundant Numbers (Long)
139th
Arabic to Roman
17th
Arithmetic Numbers
119th
Ascending Primes
83rd
Catalan Numbers
135th
Christmas Trees
219th
Collatz
320th
Day of Week
161st
Divisors
395th
Evil Numbers
1st
Evil Numbers (Long)
41st
Farey Sequence
136th
Fibonacci
66th189th
Fizz Buzz
88th693rd
Foo Fizz Buzz Bar
293rd
Fractions
55th
Happy Numbers
205th
Happy Numbers (Long)
115th
ISBN
70th
Leap Years
431st
Look and Say
82nd
Lucky Numbers
88th
Niven Numbers
308th
Niven Numbers (Long)
119th
Odious Numbers
156th
Odious Numbers (Long)
111th
Ordinal Numbers
5th
Pangram Grep
185th
Pascal’s Triangle
82nd
Pernicious Numbers
148th
Pernicious Numbers (Long)
100th
Prime Numbers
56th
Prime Numbers (Long)
203rd
Quine
1st75th
Roman to Arabic
111th
Tongue-twisters
106th
Vampire Numbers
68th