12 Days of Christmas
411
99 Bottles of Beer
415
Abundant Numbers
738
Christmas Trees
594
Collatz
796
Divisors
837
Emirp Numbers
468
Evil Numbers
784
Fibonacci
909282
Fizz Buzz
739
Happy Numbers
539
Morse Decoder
331
Niven Numbers
859
Odious Numbers
781
Pangram Grep
Pascal’s Triangle
586
Pernicious Numbers
721
Prime Numbers
665
Quine
962945
Recamán
861
Roman to Arabic
467
Seven Segment
525
Sierpiński Triangle
647
Spelling Numbers
292
United States