12 Days of Christmas
661
Abundant Numbers
811
Abundant Numbers (Long)
883
Arithmetic Numbers
771
Ascending Primes
598
Catalan Numbers
516
Catalan’s Constant
103
Collatz
735
Divisors
746
Emirp Numbers
462
Emirp Numbers (Long)
676
Evil Numbers
878498
Evil Numbers (Long)
864507
Factorial Factorisation
146
Farey Sequence
445
Fibonacci
609
Fizz Buzz
717645549
Foo Fizz Buzz Bar
753680
Fractions
849
Happy Numbers
345
Happy Numbers (Long)
447
Leap Years
705
Look and Say
640
Medal Tally
465
Niven Numbers
627
Niven Numbers (Long)
785
Odious Numbers
896505
Odious Numbers (Long)
897510
Pangram Grep
558
Pernicious Numbers
749
Pernicious Numbers (Long)
770
Prime Numbers
642
Prime Numbers (Long)
791
Quine
597
Recamán
560
Time Distance
666
Tongue-twisters
427
United States
234
π