12 Days of Christmas
9th
99 Bottles of Beer
5th
Abundant Numbers
5th
Arabic to Roman
Christmas Trees
4th
Cubes
5th
Diamonds
7th
Divisors
1st
Emirp Numbers
8th
Emojify
Evil Numbers
7th
Fibonacci
9th
Fizz Buzz
8th
Happy Numbers
10th
Intersection
5th
Kolakoski Constant
5th
Kolakoski Sequence
8th
Leap Years
10th
Leyland Numbers
4th
Look and Say
6th
Lucky Tickets
Morse Decoder
4th
Morse Encoder
5th
Niven Numbers
1st
Odious Numbers
7th
Ordinal Numbers
Pangram Grep
Pascal’s Triangle
8th
Pernicious Numbers
10th
Prime Numbers
5th
Recamán
6th
Rule 110
Seven Segment
7th
Sierpiński Triangle
Tongue-twisters
6th
United States
5th
Vampire Numbers
5th
λ
12th
π
11th
τ
11th
φ
13th
√2
13th
𝑒
8th