Abundant Numbers
41st
Divisors
51st
Emirp Numbers
40th
Evil Numbers
64th
Fibonacci
175th
Fizz Buzz
235th
Happy Numbers
80th
Leap Years
66th
Lucky Tickets
12th
Morse Decoder
12th
Morse Encoder
13th
Niven Numbers
51st
Odious Numbers
61st
Ordinal Numbers
25th
Pangram Grep
35th
Pascal’s Triangle
33rd
Pernicious Numbers
51st
Poker
11th
Prime Numbers
80th
Rock-paper-scissors-Spock-lizard
15th
Rule 110
16th
Seven Segment
21st
Sierpiński Triangle
33rd
Spelling Numbers
13th
Sudoku
10th
π
23rd
τ
19th
φ
24th
√2
29th
𝑒
19th