12 Days of Christmas
391
Abundant Numbers
649
Abundant Numbers (Long)
861
Arithmetic Numbers
676
Ascending Primes
536
Catalan Numbers
514
Catalan’s Constant
84
Collatz
719
Divisors
780
Emirp Numbers
314
Emirp Numbers (Long)
630
Evil Numbers
770489
Evil Numbers (Long)
844498
Factorial Factorisation
112
Farey Sequence
444
Fibonacci
607
Fizz Buzz
709643501
Foo Fizz Buzz Bar
622676
Fractions
844
Happy Numbers
250
Happy Numbers (Long)
402
Leap Years
701
Look and Say
607
Medal Tally
378
Niven Numbers
541
Niven Numbers (Long)
819
Odious Numbers
786504
Odious Numbers (Long)
877509
Pangram Grep
528
Pernicious Numbers
716
Pernicious Numbers (Long)
742
Prime Numbers
572
Prime Numbers (Long)
763
Quine
590
Recamán
556
Time Distance
423
Tongue-twisters
267
United States
190
π