12 Days of Christmas
775884
99 Bottles of Beer
825
Abundant Numbers
783
Christmas Trees
626
Collatz
876
Diamonds
380
Divisors
890
Fibonacci
926
Fizz Buzz
873834
Happy Numbers
502
Intersection
693
Kolakoski Sequence
641
Leap Years
756
Look and Say
648626
Niven Numbers (Long)
792
Ordinal Numbers
668
Pascal’s Triangle
637
Prime Numbers
839
Quine
928
Roman to Arabic
439
Seven Segment
665
Sierpiński Triangle
407
φ
198
√2
223