12 Days of Christmas
167th
Abundant Numbers
71st33rd
Abundant Numbers (Long)
50th28th
Alphabetic Numbers
9th
Arithmetic Numbers
26th
Ascending Primes
25th
Chess Move Validation
13th
Collatz
76th
Divisors
199th
Evil Numbers
119th
Evil Numbers (Long)
77th
Factorial Factorisation
14th
Farey Sequence
40th
Fibonacci
515th
Fizz Buzz
33rd
Fractions
55th
Leap Years
179th
Look and Say
27th
Niven Numbers
168th
Niven Numbers (Long)
79th
Odious Numbers
98th
Odious Numbers (Long)
67th
Prime Numbers
119th
Prime Numbers (Long)
77th
Quine
112th
92nd