12 Days of Christmas
759884
99 Bottles of Beer
Abundant Numbers
767
Christmas Trees
616
Collatz
863
Diamonds
377
Divisors
875
Fibonacci
920
Fizz Buzz
870825
Happy Numbers
499
Intersection
686
Kolakoski Sequence
647
Leap Years
665
Look and Say
645617
Niven Numbers (Long)
771
Ordinal Numbers
648
Pascal’s Triangle
634
Prime Numbers
838
Quine
927
Roman to Arabic
434
Seven Segment
660
Sierpiński Triangle
445
φ
191
√2
209