12 Days of Christmas
299th
Abundant Numbers
387th
Christmas Trees
107th
Diamonds
518th
Divisors
1st
Emirp Numbers
252nd
Evil Numbers
516th
Fibonacci
197th
Fizz Buzz
709th
Happy Numbers
573rd
Leap Years
447th
Leyland Numbers
351st
Morse Decoder
135th
Morse Encoder
129th
Niven Numbers
90th
Odious Numbers
319th
Ordinal Numbers
196th
Pangram Grep
65th
Pascal’s Triangle
1st
Pernicious Numbers
290th
Prime Numbers
500th
Recamán
193rd
Rock-paper-scissors-Spock-lizard
90th
Seven Segment
160th
Sierpiński Triangle
72nd
φ
138th
√2
378th
𝑒
261st