12 Days of Christmas
16th
99 Bottles of Beer
85th
5th
Abundant Numbers
16th
23rd
3rd
Abundant Numbers (Long)
3rd
Arithmetic Numbers
2nd
Ascending Primes
14th
ASCII Table
6th
Catalan Numbers
28th
Christmas Trees
3rd
Collatz
7th
Day of Week
1st
Divisors
75th
1st
Emirp Numbers
20th
Emojify
6th
Evil Numbers
21st
56th
3rd
Evil Numbers (Long)
11th
Farey Sequence
1st
Fibonacci
6th
Foo Fizz Buzz Bar
4th
Fractions
1st
Happy Numbers
13th
15th
Happy Numbers (Long)
1st
Hexdump
10th
Inventory Sequence
12th
ISBN
12th
Kolakoski Constant
7th
Kolakoski Sequence
17th
Leap Years
13th
47th
14th
Leyland Numbers
35th
2nd
Look and Say
17th
Medal Tally
13th
Musical Chords
7th
Niven Numbers
1st
23rd
Niven Numbers (Long)
1st
Number Spiral
8th
Odious Numbers
51st
5th
Odious Numbers (Long)
9th
Ordinal Numbers
46th
1st
Pangram Grep
2nd
Pascal’s Triangle
65th
1st
Pernicious Numbers
46th
30th
Pernicious Numbers (Long)
4th
Prime Numbers
64th
1st
Prime Numbers (Long)
1st
Quine
1st
Recamán
6th
Reverse Polish Notation
9th
Rule 110
20th
Seven Segment
21st
Sierpiński Triangle
46th
16th
Smith Numbers
7th
Spelling Numbers
2nd
2nd
2nd
Tongue-twisters
16th
United States
40th
13th
Van Eck Sequence
13th
1st
π
6th
τ
9th
φ
19th
√2
11th
𝑒
8th