12 Days of Christmas
170th
Abundant Numbers
69th33rd
Abundant Numbers (Long)
49th28th
Alphabetic Numbers
9th
Arithmetic Numbers
23rd
Ascending Primes
25th
Chess Move Validation
13th
Collatz
75th
Divisors
199th
Evil Numbers
118th
Evil Numbers (Long)
77th
Factorial Factorisation
14th
Farey Sequence
40th
Fibonacci
514th
Fizz Buzz
32nd
Fractions
55th
Leap Years
179th
Look and Say
27th
Niven Numbers
168th
Niven Numbers (Long)
79th
Odious Numbers
97th
Odious Numbers (Long)
67th
Prime Numbers
119th
Prime Numbers (Long)
77th
Quine
112th
92nd