12 Days of Christmas
127
99 Bottles of Beer
694
Abundant Numbers
535
Abundant Numbers (Long)
589
Arabic to Roman
248
Arithmetic Numbers
643
Arrows
515
Ascending Primes
148
ASCII Table
410
Card Number Validation
640
Catalan Numbers
493
Christmas Trees
145
Collatz
654
CSS Colors
107
Day of Week
692
Divisors
694607
Emirp Numbers
334
Evil Numbers
553982
Evil Numbers (Long)
567952
Factorial Factorisation
521
Farey Sequence
545
Fibonacci
811872964935
Fizz Buzz
712965
Foo Fizz Buzz Bar
691
Forsyth–Edwards Notation
270
Fractions
577
Happy Numbers
543
Happy Numbers (Long)
590
ISBN
609
Leap Years
764
Leyland Numbers
791
ln 2
910
Look and Say
616
Niven Numbers
597
Niven Numbers (Long)
568
Odious Numbers
911980
Odious Numbers (Long)
575973
Ordinal Numbers
533
Pascal’s Triangle
359
Pernicious Numbers
335
Pernicious Numbers (Long)
391
Prime Numbers
453
Prime Numbers (Long)
473
Recamán
582
Set
467
Spelling Numbers
441
United States
68
π
343
τ
315