12 Days of Christmas
661
Abundant Numbers
806
Abundant Numbers (Long)
879
Arithmetic Numbers
768
Ascending Primes
607
Catalan Numbers
514
Catalan’s Constant
103
Collatz
750
Divisors
780
Emirp Numbers
466
Emirp Numbers (Long)
672
Evil Numbers
876497
Evil Numbers (Long)
861506
Factorial Factorisation
146
Farey Sequence
444
Fibonacci
607
Fizz Buzz
716645549
Foo Fizz Buzz Bar
752680
Fractions
844
Happy Numbers
344
Happy Numbers (Long)
445
Leap Years
715
Look and Say
645
Medal Tally
463
Niven Numbers
624
Niven Numbers (Long)
845
Odious Numbers
893504
Odious Numbers (Long)
895509
Pangram Grep
556
Pernicious Numbers
759
Pernicious Numbers (Long)
767
Prime Numbers
638
Prime Numbers (Long)
788
Quine
590
Recamán
558
Time Distance
673
Tongue-twisters
427
United States
234
π