12 Days of Christmas
264th
Abundant Numbers
344th
Christmas Trees
84th
Diamonds
477th
Divisors
1st
Emirp Numbers
226th
Evil Numbers
458th
Fibonacci
163rd
Fizz Buzz
658th
Happy Numbers
536th
Leap Years
403rd
Leyland Numbers
313th
Morse Decoder
114th
Morse Encoder
108th
Niven Numbers
64th
Odious Numbers
272nd
Ordinal Numbers
178th
Pangram Grep
52nd
Pascal’s Triangle
1st
Pernicious Numbers
255th
Prime Numbers
452nd
Recamán
167th
Rock-paper-scissors-Spock-lizard
77th
Seven Segment
141st
Sierpiński Triangle
57th
φ
119th
√2
343rd
𝑒
232nd