Abundant Numbers
43rd
Christmas Trees
32nd
Day of Week
1st
Diamonds
14th
Divisors
1st
Emirp Numbers
11th
Fibonacci
1st
Fizz Buzz
12th
Leap Years
32nd
ln 2
10th
Look and Say
19th
Ordinal Numbers
11th
Pangram Grep
20th
Pascal’s Triangle
19th
Pernicious Numbers
32nd
Prime Numbers
25th
Quine
1st
Recamán
10th