12 Days of Christmas
11th
Abundant Numbers
8th
Abundant Numbers (Long)
8th
Arithmetic Numbers
9th
Ascending Primes
8th
Catalan Numbers
11th
Catalan’s Constant
6th
Collatz
9th
Divisors
11th
Emirp Numbers
10th
Emirp Numbers (Long)
7th
Evil Numbers
8th40th
Evil Numbers (Long)
8th23rd
Factorial Factorisation
6th
Farey Sequence
14th
Fibonacci
20th
Fizz Buzz
21st246th2,140th
Foo Fizz Buzz Bar
10th57th
Fractions
9th
Happy Numbers
16th
Happy Numbers (Long)
10th
Leap Years
10th
Look and Say
9th
Medal Tally
7th
Niven Numbers
15th
Niven Numbers (Long)
9th
Odious Numbers
10th40th
Odious Numbers (Long)
8th22nd
Pangram Grep
12th
Pernicious Numbers
11th
Pernicious Numbers (Long)
8th
Prime Numbers
11th
Prime Numbers (Long)
10th
Quine
14th
Recamán
6th
Time Distance
5th
Tongue-twisters
16th
United States
6th
π
8th