12 Days of Christmas
818
99 Bottles of Beer
669
Abundant Numbers
777
Arabic to Roman
527
339
Arrows
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Christmas Trees
544
CSS Colors
189
Cubes
45
Diamonds
461
Divisors
810
Emirp Numbers
656
Evil Numbers
609
Fibonacci
893
Fizz Buzz
741
Fractions
514
Happy Numbers
574
Happy Numbers (Long)
513
Kolakoski Constant
105
Kolakoski Sequence
27
Leap Years
839
Leyland Numbers
115
Look and Say
57
Niven Numbers
861
Odious Numbers
605
Ordinal Numbers
506
Pangram Grep
367
Pascal’s Triangle
489
Pernicious Numbers
391
Prime Numbers
831
336
Quine
986759628634928482994345555413393280687889859871193894558382195367628594559788664181966616749
Recamán
70
Rule 110
Sierpiński Triangle
96
Smith Numbers
47
Tongue-twisters
522
United States
158
Vampire Numbers
104
Van Eck Sequence
23
λ
266
π
100
τ
98
φ
101
√2
96
𝑒
80