12 Days of Christmas
11th
Abundant Numbers
214th
Abundant Numbers (Long)
158th
Arabic to Roman
72nd
Arithmetic Numbers
141st
Ascending Primes
95th
Catalan Numbers
131st
Christmas Trees
247th
Collatz
340th
Day of Week
166th
Divisors
424th
Evil Numbers
1st
Evil Numbers (Long)
38th
Farey Sequence
139th
Fibonacci
64th186th
Fizz Buzz
88th134th
Foo Fizz Buzz Bar
99th
Fractions
38th
Happy Numbers
228th
Happy Numbers (Long)
134th
ISBN
108th
Leap Years
433rd
Look and Say
40th
Lucky Numbers
102nd
Niven Numbers
314th
Niven Numbers (Long)
128th
Odious Numbers
153rd
Odious Numbers (Long)
109th
Ordinal Numbers
87th
Pangram Grep
206th
Pascal’s Triangle
44th
Pernicious Numbers
144th
Pernicious Numbers (Long)
99th
Prime Numbers
53rd
Prime Numbers (Long)
224th
Quine
1st72nd
Roman to Arabic
128th
Tongue-twisters
159th
Vampire Numbers
90th