12 Days of Christmas
12th
Abundant Numbers
10th
Abundant Numbers (Long)
11th
Arithmetic Numbers
10th
Ascending Primes
8th
Catalan Numbers
13th
Catalan’s Constant
6th
Collatz
11th
Divisors
14th
Emirp Numbers
12th
Emirp Numbers (Long)
7th
Evil Numbers
11th47th
Evil Numbers (Long)
11th29th
Factorial Factorisation
7th
Farey Sequence
16th
Fibonacci
22nd
Fizz Buzz
26th263rd2,249th
Foo Fizz Buzz Bar
10th64th
Fractions
11th
Happy Numbers
19th
Happy Numbers (Long)
12th
Leap Years
13th
Look and Say
11th
Medal Tally
8th
Niven Numbers
17th
Niven Numbers (Long)
10th
Odious Numbers
12th47th
Odious Numbers (Long)
11th27th
Pangram Grep
14th
Pernicious Numbers
14th
Pernicious Numbers (Long)
11th
Prime Numbers
13th
Prime Numbers (Long)
13th
Quine
15th
Recamán
7th
Time Distance
5th
Tongue-twisters
18th
United States
7th
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