12 Days of Christmas
29th
99 Bottles of Beer
22nd
Abundant Numbers
8th
Abundant Numbers (Long)
1st
Arithmetic Numbers
1st
Ascending Primes
4th
ASCII Table
13th
Card Number Validation
Christmas Trees
5th
Collatz
11th
Cubes
12th
Day of Week
Diamonds
9th
Divisors
1st
Emirp Numbers
16th
Emirp Numbers (Long)
13th
Evil Numbers
5th
Evil Numbers (Long)
2nd
Factorial Factorisation
8th
Farey Sequence
29th
Fibonacci
4th
Fizz Buzz
1st
Foo Fizz Buzz Bar
11th
Fractions
18th
Game of Life
24th
Gijswijt’s Sequence
10th
Happy Numbers
60th
Happy Numbers (Long)
8th
Intersection
5th3rd
Inventory Sequence
2nd
ISBN
5th
Jacobi Symbol
6th
Kaprekar Numbers
14th
Kolakoski Sequence
30th
Leap Years
7th
Levenshtein Distance
14th
Leyland Numbers
14th
Look and Say
9th
Lucky Numbers
16th
Lucky Tickets
8th
Mahjong
5th
Maze
8th
Medal Tally
3rd
N Queens
9th
Niven Numbers
1st
Niven Numbers (Long)
8th
Number Spiral
31st
Odious Numbers
17th
Odious Numbers (Long)
14th
Ordinal Numbers
11th
PalindromemordnilaP
9th
Pangram Grep
Pascal’s Triangle
7th
Pernicious Numbers
1st
Pernicious Numbers (Long)
7th
Prime Numbers
7th
Prime Numbers (Long)
1st16th
Proximity Grid
9th
Quine
27th
Recamán
1st
Repeating Decimals
6th
Reverse Polish Notation
9th
Reversi
2nd💎
Rijndael S-box
16th
ROT13
10th
Rule 110
10th
Seven Segment
16th
Sierpiński Triangle
20th
Smith Numbers
7th
Sudoku (Fill-in)
Tic-tac-toe
8th
Transpose Sentence
7th
United States
27th
Vampire Numbers
8th
Van Eck Sequence
1st
Zeckendorf Representation
12th
π
12th
√2