12 Days of Christmas
758881
99 Bottles of Beer
Abundant Numbers
768
Christmas Trees
616
Collatz
863
Diamonds
376
Divisors
875
Fibonacci
920
Fizz Buzz
870824
Happy Numbers
499
Intersection
686
Kolakoski Sequence
642
Leap Years
665
Look and Say
645618
Niven Numbers (Long)
771
Ordinal Numbers
644
Pascal’s Triangle
635
Prime Numbers
838
Quine
927
Roman to Arabic
434
Seven Segment
661
Sierpiński Triangle
444
φ
191
√2
209