12 Days of Christmas
400
Abundant Numbers
644
Abundant Numbers (Long)
853
Arithmetic Numbers
702
Ascending Primes
602
Catalan Numbers
509
Catalan’s Constant
187
Collatz
728
Divisors
775
Emirp Numbers
313
Emirp Numbers (Long)
629
Evil Numbers
761
801
Evil Numbers (Long)
833
793
Factorial Factorisation
144
Farey Sequence
446
Fibonacci
634
Fizz Buzz
706
913
501
Foo Fizz Buzz Bar
618
851
Fractions
851
Happy Numbers
249
Happy Numbers (Long)
411
Leap Years
694
Look and Say
639
Medal Tally
394
Niven Numbers
537
Niven Numbers (Long)
822
Odious Numbers
777
813
Odious Numbers (Long)
866
797
Pangram Grep
537
Pernicious Numbers
708
Pernicious Numbers (Long)
733
Prime Numbers
567
Prime Numbers (Long)
753
Quine
590
Recamán
552
Time Distance
484
Tongue-twisters
266
United States
208
π
77