12 Days of Christmas
10th
Abundant Numbers
8th
Abundant Numbers (Long)
8th
Arithmetic Numbers
9th
Ascending Primes
7th
Catalan Numbers
10th
Catalan’s Constant
6th
Collatz
9th
Divisors
11th
Emirp Numbers
10th
Emirp Numbers (Long)
6th
Evil Numbers
8th40th
Evil Numbers (Long)
8th23rd
Factorial Factorisation
6th
Farey Sequence
13th
Fibonacci
21st
Fizz Buzz
21st245th2,120th
Foo Fizz Buzz Bar
10th56th
Fractions
8th
Happy Numbers
15th
Happy Numbers (Long)
10th
Leap Years
10th
Look and Say
9th
Medal Tally
7th
Niven Numbers
14th
Niven Numbers (Long)
6th
Odious Numbers
9th40th
Odious Numbers (Long)
7th22nd
Pangram Grep
10th
Pernicious Numbers
11th
Pernicious Numbers (Long)
8th
Prime Numbers
10th
Prime Numbers (Long)
8th
Quine
13th
Recamán
6th
Time Distance
5th
Tongue-twisters
15th
United States
5th
π
8th