12 Days of Christmas
261
99 Bottles of Beer
249
Abundant Numbers
686
Abundant Numbers (Long)
751
Catalan Numbers
520
Catalan’s Constant
59
Christmas Trees
513
Collatz
611
Diamonds
303
Divisors
837
Emirp Numbers
464
Emirp Numbers (Long)
512
Evil Numbers
754
Evil Numbers (Long)
738
Fibonacci
886
Fizz Buzz
570
Foo Fizz Buzz Bar
495
Leap Years
812
Niven Numbers
740
Niven Numbers (Long)
806
Odious Numbers
781
Odious Numbers (Long)
779
Ordinal Numbers
507
Pernicious Numbers
309
Prime Numbers
585
Prime Numbers (Long)
619
λ
96
π
56
τ
56
φ
50
√2
46
𝑒
45