12 Days of Christmas
906
99 Bottles of Beer
667
Abundant Numbers
773
Abundant Numbers (Long)
939
Arabic to Roman
701
Arithmetic Numbers
869
Ascending Primes
271
Catalan Numbers
721
Collatz
919
Divisors
1,000
Evil Numbers (Long)
820
Fibonacci
947
Fizz Buzz
951
Happy Numbers
697
Happy Numbers (Long)
766
ISBN
645
Prime Numbers
714