Abundant Numbers
39th
Christmas Trees
30th
Day of Week
1st
Diamonds
14th
Divisors
1st
Emirp Numbers
10th
Fibonacci
1st
Fizz Buzz
12th
Leap Years
29th
ln 2
10th
Look and Say
17th
Ordinal Numbers
8th
Pangram Grep
21st
Pascal’s Triangle
23rd
Pernicious Numbers
32nd
Prime Numbers
24th
Quine
1st
Recamán
9th