12 Days of Christmas
661
Abundant Numbers
806
Abundant Numbers (Long)
879
Arithmetic Numbers
798
Ascending Primes
606
Catalan Numbers
514
Catalan’s Constant
126
Collatz
750
Divisors
780
Emirp Numbers
466
Emirp Numbers (Long)
671
Evil Numbers
876497
Evil Numbers (Long)
861505
Factorial Factorisation
146
Farey Sequence
445
Fibonacci
607
Fizz Buzz
716645549
Foo Fizz Buzz Bar
752680
Fractions
843
Happy Numbers
344
Happy Numbers (Long)
464
Leap Years
715
Look and Say
645
Medal Tally
463
Niven Numbers
624
Niven Numbers (Long)
845
Odious Numbers
893504
Odious Numbers (Long)
895508
Pangram Grep
554
Pernicious Numbers
759
Pernicious Numbers (Long)
767
Prime Numbers
638
Prime Numbers (Long)
788
Quine
590
Recamán
558
Time Distance
684
Tongue-twisters
427
United States
234
π