12 Days of Christmas
11th
Abundant Numbers
8th
Abundant Numbers (Long)
9th
Arithmetic Numbers
10th
Ascending Primes
9th
Catalan Numbers
11th
Catalan’s Constant
6th
Collatz
10th
Divisors
11th
Emirp Numbers
10th
Emirp Numbers (Long)
8th
Evil Numbers
9th40th
Evil Numbers (Long)
9th26th
Factorial Factorisation
8th
Farey Sequence
14th
Fibonacci
20th
Fizz Buzz
22nd250th2,168th
Foo Fizz Buzz Bar
10th57th
Fractions
10th
Happy Numbers
16th
Happy Numbers (Long)
10th
Leap Years
10th
Look and Say
10th
Medal Tally
7th
Niven Numbers
15th
Niven Numbers (Long)
10th
Odious Numbers
10th40th
Odious Numbers (Long)
9th22nd
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
17th
United States
6th
π
8th