12 Days of Christmas
775883
99 Bottles of Beer
825
Abundant Numbers
784
Christmas Trees
628
Collatz
880
Diamonds
380
Divisors
891
Fibonacci
927
Fizz Buzz
873835
Happy Numbers
502
Intersection
696
Kolakoski Sequence
644
Leap Years
757
Look and Say
649630
Niven Numbers (Long)
795
Ordinal Numbers
670
Pascal’s Triangle
641
Prime Numbers
841
Quine
924
Roman to Arabic
440
Seven Segment
669
Sierpiński Triangle
407
φ
192
√2
211