12 Days of Christmas
391
Abundant Numbers
649
Abundant Numbers (Long)
861
Arithmetic Numbers
699
Ascending Primes
606
Catalan Numbers
514
Catalan’s Constant
125
Collatz
718
Divisors
780
Emirp Numbers
314
Emirp Numbers (Long)
635
Evil Numbers
770489
Evil Numbers (Long)
844497
Factorial Factorisation
122
Farey Sequence
445
Fibonacci
607
Fizz Buzz
709643501
Foo Fizz Buzz Bar
622676
Fractions
843
Happy Numbers
250
Happy Numbers (Long)
411
Leap Years
701
Look and Say
607
Medal Tally
378
Niven Numbers
541
Niven Numbers (Long)
819
Odious Numbers
786504
Odious Numbers (Long)
877508
Pangram Grep
526
Pernicious Numbers
716
Pernicious Numbers (Long)
742
Prime Numbers
572
Prime Numbers (Long)
763
Quine
590
Recamán
556
Time Distance
484
Tongue-twisters
267
United States
190
π