12 Days of Christmas
780913
99 Bottles of Beer
857
Abundant Numbers
836
Christmas Trees
678
Collatz
944
Diamonds
387
Divisors
955
Fibonacci
978
Fizz Buzz
879859
Happy Numbers
512
Intersection
791
Kolakoski Sequence
726
Leap Years
796
Look and Say
667697
Niven Numbers (Long)
859
Ordinal Numbers
741
Pascal’s Triangle
709
Prime Numbers
909
Quine
1,000
Roman to Arabic
487
Seven Segment
744
Sierpiński Triangle
435
φ
221
√2
247