12 Days of Christmas
661
Abundant Numbers
792
Abundant Numbers (Long)
861
Arithmetic Numbers
753
Ascending Primes
589
Catalan Numbers
507
Catalan’s Constant
101
Collatz
721
Divisors
725
Emirp Numbers
454
Emirp Numbers (Long)
665
Evil Numbers
872496
Evil Numbers (Long)
854504
Factorial Factorisation
144
Farey Sequence
445
Fibonacci
601
Fizz Buzz
705642547
Foo Fizz Buzz Bar
742677
Fractions
847
Happy Numbers
336
Happy Numbers (Long)
438
Leap Years
658
Look and Say
626
Medal Tally
449
Niven Numbers
606
Niven Numbers (Long)
761
Odious Numbers
884501
Odious Numbers (Long)
882505
Pangram Grep
544
Pernicious Numbers
735
Pernicious Numbers (Long)
749
Prime Numbers
638
Prime Numbers (Long)
783
Quine
594
Recamán
544
Time Distance
651
Tongue-twisters
427
United States
228
π