12 Days of Christmas
268th
Abundant Numbers
352nd
Christmas Trees
84th
Diamonds
481st
Divisors
1st
Emirp Numbers
227th
Evil Numbers
466th
Fibonacci
166th
Fizz Buzz
665th
Happy Numbers
540th
Leap Years
409th
Leyland Numbers
315th
Morse Decoder
115th
Morse Encoder
110th
Niven Numbers
66th
Odious Numbers
275th
Ordinal Numbers
179th
Pangram Grep
52nd
Pascal’s Triangle
1st
Pernicious Numbers
258th
Prime Numbers
457th
Recamán
168th
Rock-paper-scissors-Spock-lizard
77th
Seven Segment
142nd
Sierpiński Triangle
57th
φ
119th
√2
346th
𝑒
233rd