Abundant Numbers
53rd
Divisors
61st
Emirp Numbers
50th
Evil Numbers
72nd
Fibonacci
209th
Fizz Buzz
257th
Happy Numbers
107th
Leap Years
78th
Lucky Tickets
15th
Morse Decoder
14th
Morse Encoder
16th
Niven Numbers
66th
Odious Numbers
73rd
Ordinal Numbers
29th
Pangram Grep
43rd
Pascal’s Triangle
41st
Pernicious Numbers
61st
Poker
15th
Prime Numbers
89th
Rock-paper-scissors-Spock-lizard
21st
Rule 110
20th
Seven Segment
25th
Sierpiński Triangle
36th
Spelling Numbers
14th
Sudoku
12th
π
26th
τ
19th
φ
31st
√2
33rd
𝑒
26th