12 Days of Christmas
55
99 Bottles of Beer
665
Abundant Numbers
778
Arabic to Roman
528
338
Arrows
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Christmas Trees
544
CSS Colors
189
Cubes
44
Diamonds
432
Divisors
810
Emirp Numbers
656
Evil Numbers
610
Fibonacci
893
Fizz Buzz
741
Fractions
514
Happy Numbers
574
Happy Numbers (Long)
513
Kolakoski Constant
105
Kolakoski Sequence
27
Leap Years
855
Leyland Numbers
115
Look and Say
57
Niven Numbers
862
Odious Numbers
593
Ordinal Numbers
504
Pangram Grep
367
Pascal’s Triangle
489
Pernicious Numbers
391
Prime Numbers
832
336
Quine
9867596286449284829943455554133932807879932598712938945583821953676286945597886642820666167116
Recamán
70
Rule 110
Sierpiński Triangle
99
Smith Numbers
47
Tongue-twisters
522
United States
158
Vampire Numbers
103
Van Eck Sequence
23
λ
266
π
100
τ
98
φ
101
√2
96
𝑒
80