12 Days of Christmas
9th
Abundant Numbers
7th
Abundant Numbers (Long)
7th
Arithmetic Numbers
9th
Ascending Primes
7th
Catalan Numbers
9th
Catalan’s Constant
4th
Collatz
8th
Divisors
11th
Emirp Numbers
9th
Emirp Numbers (Long)
6th
Evil Numbers
7th
40th
Evil Numbers (Long)
7th
25th
Factorial Factorisation
6th
Farey Sequence
11th
Fibonacci
16th
Fizz Buzz
21st
243rd
2,097th
Foo Fizz Buzz Bar
9th
56th
Fractions
7th
Happy Numbers
14th
Happy Numbers (Long)
8th
Leap Years
10th
Look and Say
8th
Medal Tally
7th
Niven Numbers
13th
Niven Numbers (Long)
7th
Odious Numbers
6th
40th
Odious Numbers (Long)
6th
22nd
Pangram Grep
9th
Pernicious Numbers
9th
Pernicious Numbers (Long)
7th
Prime Numbers
9th
Prime Numbers (Long)
7th
Quine
12th
Recamán
5th
Time Distance
5th
Tongue-twisters
14th
United States
5th
π
5th