12 Days of Christmas
775
885
99 Bottles of Beer
825
Abundant Numbers
783
Christmas Trees
625
Collatz
875
Diamonds
380
Divisors
890
Fibonacci
925
Fizz Buzz
873
834
Happy Numbers
501
Intersection
693
Kolakoski Sequence
641
Leap Years
756
Look and Say
648
626
Niven Numbers (Long)
792
Ordinal Numbers
666
Pascal’s Triangle
637
Prime Numbers
839
Quine
927
Roman to Arabic
439
Seven Segment
665
Sierpiński Triangle
407
φ
198
√2
223