12 Days of Christmas
661
Abundant Numbers
804
Abundant Numbers (Long)
877
Arithmetic Numbers
796
Ascending Primes
606
Catalan Numbers
513
Catalan’s Constant
476
Collatz
747
Divisors
779
Emirp Numbers
477
Emirp Numbers (Long)
670
Evil Numbers
871811
Evil Numbers (Long)
857804
Factorial Factorisation
146
Farey Sequence
444
Fibonacci
606
Fizz Buzz
715916549
Foo Fizz Buzz Bar
749857
Fractions
839
Happy Numbers
343
Happy Numbers (Long)
471
Leap Years
712
Look and Say
643
Medal Tally
467
Niven Numbers
623
Niven Numbers (Long)
843
Odious Numbers
889815
Odious Numbers (Long)
890800
Pangram Grep
551
Pernicious Numbers
756
Pernicious Numbers (Long)
764
Prime Numbers
636
Prime Numbers (Long)
785
Quine
595
Recamán
557
Time Distance
684
Tongue-twisters
426
United States
261
π